Integration Examples

Real code examples showing how to use the Area Code Database in your applications. Each example demonstrates phone number validation with NPA-NXX lookup.

Download Complete Code Samples →

Python: Validate Phone Number with NPA-NXX Lookup

import csv

# Load NPA-NXX database into memory (do this once at startup)
# For production: consider using a database or caching layer
npanxx_lookup = {}

with open('npanxx_deluxe.csv', 'r', encoding='utf-8') as f:
    reader = csv.DictReader(f)
    for row in reader:
        npanxx_lookup[row['NPANXX']] = row

def validate_phone(phone_number):
    """
    Validate a 10-digit phone number and return location/carrier info.
    Returns dict with validation result and metadata.
    """
    # Extract first 6 digits (NPA-NXX)
    # Production tip: add input sanitization for (555) 123-4567 format
    npanxx = phone_number.replace('-', '').replace('(', '').replace(')', '')[:6]
    
    if npanxx in npanxx_lookup:
        data = npanxx_lookup[npanxx]
        return {
            'valid': True,
            'npanxx': npanxx,
            'state': data['State'],
            'city': data.get('City', 'N/A'),  # Deluxe only
            'timezone': data.get('TimeZone', 'N/A'),  # Deluxe only
            'carrier': data.get('Company', 'N/A'),  # Deluxe only
            'type': 'Wireless' if data.get('NXXUseType') == 'W' else 'Landline',
            'active': data.get('Status') == 'Active'
        }
    
    return {'valid': False, 'npanxx': npanxx, 'error': 'Invalid NPA-NXX combination'}

# Example usage
result = validate_phone('2125551234')
print(f"Valid: {result['valid']}")
if result['valid']:
    print(f"Location: {result['city']}, {result['state']}")
    print(f"Carrier: {result['carrier']}")
    print(f"Type: {result['type']}")

Performance tip: Loading 558K records into a dictionary uses ~50-100MB RAM but enables microsecond lookups. For web applications, load once at startup and reuse across requests.

PHP: Validate Phone Number with NPA-NXX Lookup

<?php
// Load NPA-NXX database (cache this in production using APCu/Redis)
// For production: use database or persistent cache instead of loading CSV each time
$npanxxLookup = [];

if (($handle = fopen('npanxx_deluxe.csv', 'r')) !== false) {
    $headers = fgetcsv($handle);
    while (($row = fgetcsv($handle)) !== false) {
        $data = array_combine($headers, $row);
        $npanxxLookup[$data['NPANXX']] = $data;
    }
    fclose($handle);
}

function validatePhone($phoneNumber, $npanxxLookup) {
    // Extract first 6 digits (NPA-NXX)
    // Production tip: use preg_replace for robust phone formatting
    $npanxx = substr(preg_replace('/[^0-9]/', '', $phoneNumber), 0, 6);
    
    if (isset($npanxxLookup[$npanxx])) {
        $data = $npanxxLookup[$npanxx];
        return [
            'valid' => true,
            'npanxx' => $npanxx,
            'state' => $data['State'],
            'city' => $data['City'] ?? 'N/A',  // Deluxe only
            'timezone' => $data['TimeZone'] ?? 'N/A',  // Deluxe only
            'carrier' => $data['Company'] ?? 'N/A',  // Deluxe only
            'type' => ($data['NXXUseType'] ?? '') === 'W' ? 'Wireless' : 'Landline',
            'active' => ($data['Status'] ?? '') === 'Active'
        ];
    }
    
    return ['valid' => false, 'npanxx' => $npanxx, 'error' => 'Invalid NPA-NXX combination'];
}

// Example usage
$result = validatePhone('(212) 555-1234', $npanxxLookup);
echo "Valid: " . ($result['valid'] ? 'Yes' : 'No') . "\n";
if ($result['valid']) {
    echo "Location: {$result['city']}, {$result['state']}\n";
    echo "Carrier: {$result['carrier']}\n";
    echo "Type: {$result['type']}\n";
}
?>

Performance tip: For high-traffic sites, import data into MySQL and use indexed lookups, or cache the array in APCu/Redis. Avoid loading the CSV on every request.

Node.js: Validate Phone Number with NPA-NXX Lookup

const fs = require('fs');
const csv = require('csv-parser');  // npm install csv-parser

// Load NPA-NXX database (do this once at module load)
// For production: consider using a database or Redis cache
const npanxxLookup = new Map();

fs.createReadStream('npanxx_deluxe.csv')
  .pipe(csv())
  .on('data', (row) => {
    npanxxLookup.set(row.NPANXX, row);
  })
  .on('end', () => {
    console.log(`Loaded ${npanxxLookup.size} NPA-NXX records`);
  });

function validatePhone(phoneNumber) {
  // Extract first 6 digits (NPA-NXX)
  // Production tip: add input validation and normalization
  const npanxx = phoneNumber.replace(/\D/g, '').substring(0, 6);
  
  if (npanxxLookup.has(npanxx)) {
    const data = npanxxLookup.get(npanxx);
    return {
      valid: true,
      npanxx: npanxx,
      state: data.State,
      city: data.City || 'N/A',  // Deluxe only
      timezone: data.TimeZone || 'N/A',  // Deluxe only
      carrier: data.Company || 'N/A',  // Deluxe only
      type: data.NXXUseType === 'W' ? 'Wireless' : 'Landline',
      active: data.Status === 'Active'
    };
  }
  
  return { valid: false, npanxx, error: 'Invalid NPA-NXX combination' };
}

// Example usage (wrap in async or use callbacks after CSV loads)
setTimeout(() => {
  const result = validatePhone('212-555-1234');
  console.log('Valid:', result.valid);
  if (result.valid) {
    console.log(`Location: ${result.city}, ${result.state}`);
    console.log(`Carrier: ${result.carrier}`);
    console.log(`Type: ${result.type}`);
  }
}, 1000);  // Wait for CSV to load

Performance tip: Map lookups are O(1) and very fast. For clustered deployments, import into MongoDB/PostgreSQL or use Redis for shared caching across instances.

SQL: Validate Phone Number with NPA-NXX Lookup

-- First, import the CSV into your database
-- MySQL example: LOAD DATA INFILE 'npanxx_deluxe.csv' 
--                INTO TABLE npanxx FIELDS TERMINATED BY ',' 
--                ENCLOSED BY '"' LINES TERMINATED BY '\n' IGNORE 1 ROWS;

-- Create indexed table for fast lookups
CREATE TABLE npanxx (
    NPANXX CHAR(6) PRIMARY KEY,
    NPA CHAR(3),
    NXX CHAR(3),
    State CHAR(2),
    City VARCHAR(100),
    County VARCHAR(100),
    TimeZone TINYINT,
    ObservesDST CHAR(1),
    NXXUseType CHAR(1),
    Company VARCHAR(255),
    OCN VARCHAR(10),
    Status VARCHAR(20),
    -- Add other fields as needed
    INDEX idx_npa (NPA),
    INDEX idx_state (State)
);

-- Validate a single phone number
SELECT 
    NPANXX,
    State,
    City,
    Company AS Carrier,
    CASE WHEN NXXUseType = 'W' THEN 'Wireless' ELSE 'Landline' END AS Type,
    CASE WHEN Status = 'Active' THEN 1 ELSE 0 END AS IsActive,
    TimeZone
FROM npanxx
WHERE NPANXX = SUBSTRING(REPLACE(REPLACE(REPLACE('(212) 555-1234', '-', ''), '(', ''), ')', ''), 1, 6);

-- Enrich existing customer table with area code data
UPDATE customers c
INNER JOIN npanxx n ON SUBSTRING(c.phone, 1, 6) = n.NPANXX
SET 
    c.phone_state = n.State,
    c.phone_city = n.City,
    c.phone_timezone = n.TimeZone,
    c.phone_carrier = n.Company,
    c.phone_type = CASE WHEN n.NXXUseType = 'W' THEN 'Wireless' ELSE 'Landline' END
WHERE c.phone IS NOT NULL;

Performance tip: Always index NPANXX (primary key), NPA, NXX, and State columns. With proper indexes, lookups complete in under 1ms even with millions of customer records.

C# / .NET: Validate Phone Number with NPA-NXX Lookup

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using CsvHelper;  // Install-Package CsvHelper
using System.Globalization;

public class NpanxxValidator
{
    private Dictionary<string, NpanxxRecord> _lookup;
    
    public NpanxxValidator(string csvPath)
    {
        // Load NPA-NXX database (do this once at application startup)
        // For production: consider using SQL Server or cache layer
        _lookup = new Dictionary<string, NpanxxRecord>();
        
        using (var reader = new StreamReader(csvPath))
        using (var csv = new CsvReader(reader, CultureInfo.InvariantCulture))
        {
            var records = csv.GetRecords<NpanxxRecord>();
            foreach (var record in records)
            {
                _lookup[record.NPANXX] = record;
            }
        }
    }
    
    public ValidationResult ValidatePhone(string phoneNumber)
    {
        // Extract first 6 digits (NPA-NXX)
        // Production tip: use Regex for robust phone number parsing
        string npanxx = new string(phoneNumber.Where(char.IsDigit).Take(6).ToArray());
        
        if (_lookup.TryGetValue(npanxx, out var data))
        {
            return new ValidationResult
            {
                Valid = true,
                Npanxx = npanxx,
                State = data.State,
                City = data.City ?? "N/A",  // Deluxe only
                Timezone = data.TimeZone ?? "N/A",  // Deluxe only
                Carrier = data.Company ?? "N/A",  // Deluxe only
                Type = data.NXXUseType == "W" ? "Wireless" : "Landline",
                Active = data.Status == "Active"
            };
        }
        
        return new ValidationResult 
        { 
            Valid = false, 
            Npanxx = npanxx, 
            Error = "Invalid NPA-NXX combination" 
        };
    }
}

// Example usage
var validator = new NpanxxValidator("npanxx_deluxe.csv");
var result = validator.ValidatePhone("(212) 555-1234");

Console.WriteLine($"Valid: {result.Valid}");
if (result.Valid)
{
    Console.WriteLine($"Location: {result.City}, {result.State}");
    Console.WriteLine($"Carrier: {result.Carrier}");
    Console.WriteLine($"Type: {result.Type}");
}

Performance tip: Dictionary lookups are extremely fast. For ASP.NET applications, load once in Startup.cs and inject as a singleton. For enterprise scale, use SQL Server with Entity Framework.

Java: Validate Phone Number with NPA-NXX Lookup

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class NpanxxValidator {
    private Map<String, NpanxxRecord> lookup;
    
    public NpanxxValidator(String csvPath) throws IOException {
        // Load NPA-NXX database (do this once at application startup)
        // For production: consider using a database or cache layer like Redis
        lookup = new HashMap<>();
        
        try (BufferedReader br = new BufferedReader(new FileReader(csvPath))) {
            String line;
            String[] headers = br.readLine().split(",");  // Skip header row
            
            while ((line = br.readLine()) != null) {
                String[] values = line.split(",(?=(?:[^\"]*\"[^\"]*\")*[^\"]*$)");  // Handle quoted commas
                NpanxxRecord record = new NpanxxRecord(headers, values);
                lookup.put(record.getNpanxx(), record);
            }
        }
    }
    
    public ValidationResult validatePhone(String phoneNumber) {
        // Extract first 6 digits (NPA-NXX)
        // Production tip: use Pattern/Matcher for robust phone formatting
        String npanxx = phoneNumber.replaceAll("[^0-9]", "").substring(0, 6);
        
        if (lookup.containsKey(npanxx)) {
            NpanxxRecord data = lookup.get(npanxx);
            return new ValidationResult(
                true,
                npanxx,
                data.getState(),
                data.getCity() != null ? data.getCity() : "N/A",  // Deluxe only
                data.getTimeZone() != null ? data.getTimeZone() : "N/A",  // Deluxe only
                data.getCompany() != null ? data.getCompany() : "N/A",  // Deluxe only
                "W".equals(data.getNxxUseType()) ? "Wireless" : "Landline",
                "Active".equals(data.getStatus())
            );
        }
        
        return new ValidationResult(false, npanxx, "Invalid NPA-NXX combination");
    }
    
    // Example usage
    public static void main(String[] args) throws IOException {
        NpanxxValidator validator = new NpanxxValidator("npanxx_deluxe.csv");
        ValidationResult result = validator.validatePhone("(212) 555-1234");
        
        System.out.println("Valid: " + result.isValid());
        if (result.isValid()) {
            System.out.println("Location: " + result.getCity() + ", " + result.getState());
            System.out.println("Carrier: " + result.getCarrier());
            System.out.println("Type: " + result.getType());
        }
    }
}

Performance tip: HashMap lookups are O(1). For Spring Boot applications, load as a @Bean singleton. For enterprise deployments, import into PostgreSQL/Oracle and use JPA for querying.

Need more examples?

These examples show basic validation. For complete implementations including CSV import, batch processing, and production-ready error handling, visit our technical documentation.

Frequently Asked Questions

Quick answers to common questions about our Area Code Database. Have Tech questions? See the full Technical FAQ.

Full Technical FAQ |

Each edition offers different levels of data depth:

Standard ($249.95/yr): 8 core data fields including NPA, NXX, State, ZIP code correlations, LATA, and frequency data. Perfect for basic call routing, number validation, and ZIP-to-area-code lookups.
Deluxe ($449.95/yr): 27 professional-grade fields adding latitude/longitude coordinates, city/county names, time zones, DST flags, carrier attribution (OCN & company name), rate centers, MSA/CBSA mapping, wireless/landline classification, and active/inactive status tracking. Ideal for advanced routing systems, fraud detection, CRM enrichment, and telecom analytics.

View detailed field comparison →

NPA-NXX (also called NPANXX or Area Code Database) represents North American telephone numbering assignments. NPA is the 3-digit area code (like 212), and NXX is the 3-digit exchange prefix (like 555). Together they identify the first 6 digits of a 10-digit phone number and determine its geographic location, carrier, and routing information.

This data is essential for:

Call routing systems: Route calls based on geographic location, time zone, or carrier
Number validation: Verify phone numbers belong to valid area code/exchange combinations
Fraud detection: Flag suspicious or newly assigned NPA-NXX blocks
Time zone determination: Schedule calls during appropriate business hours
Geographic attribution: Map phone numbers to cities, counties, and states
CRM enrichment: Append carrier and location data to customer records
Telecom analytics: Analyze call patterns by region, carrier type, or service area

Unlike individual phone number lookups, NPA-NXX data gives you the infrastructure intelligence behind the North American telephone network-no per-query fees, no rate limits, just complete control over your routing and validation logic.

Every purchase includes 12 months of quarterly updates at no additional cost. Four times per year, we synchronize with NANPA updates and release a fresh version of the complete database. Each update is a full file refresh-not incremental deltas-ensuring data consistency.

Access your updates two ways:

Manual Download: Log into your account and download the latest version anytime
Automated FTP/SFTP/FTPS: We'll set up free secure FTP access so you can automate quarterly imports

After 12 months, you keep all the data you've downloaded. Renewal is only needed if you want to continue receiving quarterly updates.

Timing: Updates are typically released mid-quarter (January, April, July, October). We send email notifications to all active subscribers when new releases are available.

Yes! You can upgrade at any time by simply paying the price difference. Your subscription end date remains the same, and you'll immediately get access to the additional 19 data fields in the Deluxe edition.

For example, if you purchased Standard ($249.95) and want to upgrade to Deluxe ($449.95), you'd pay $200 (the difference), and your 12-month update period stays unchanged. This is accessible directly from your Account Homepage. It will list all of your subscriptions and offer an immediate upgrade option. No waiting, the upgrade is instantaneous. Contact us if you have any further questions.

Every subscription includes:

12 months of updates: Four quarterly full-file refreshes synchronized with NANPA
All file formats: CSV, Tab-Delimited (TAB), and Microsoft Access (MDB)
Immediate download: Access your data within minutes of purchase
Free FTP/SFTP/FTPS access: Automate your quarterly updates (setup on request)
Unlimited internal use: No per-user fees, no query limits, no throttling
Email & phone support: Real people ready to help with implementation questions
30-day money-back guarantee: Full refund if you're not satisfied, no questions asked

You keep the data forever: After your subscription ends, you retain all downloaded files. Renewal is only required if you want continued quarterly updates.

Need redistribution rights? We offer separate licensing for embedding data in commercial products. Select Edition to see Redistribution pricing →

ZIP code boundaries and telephone exchange boundaries don't align perfectly-they were designed for different purposes (postal delivery vs. telecom infrastructure). Our database includes ZipCodeFreq rankings to show which ZIP codes are most commonly associated with each NPA-NXX:

ZipCodeFreq = -1: Most frequent (primary service area)
ZipCodeFreq = -2: Second most frequent
ZipCodeFreq = 0: Frequency data unavailable

We also include ZipCodeCount (population estimate) to help you assess reliability. ZIP codes with less than 2% frequency are excluded as statistically insignificant.

Best practices: For precise applications, use the -1 ranked ZIP codes, which represent the primary service area. For comprehensive coverage, include -2 ranked codes as well. The combination provides excellent geographic attribution for most business applications.

Our database is derived directly from NANPA (North American Numbering Plan Administration)-the official authority for area code and exchange assignments. This is the same authoritative source used by all telecom carriers in North America.

Our quality process:

Quarterly NANPA synchronization: We process official assignment files every quarter
Cross-reference validation: ZIP code correlations verified against USPS and Census data
Internal enrichment: Coordinates, time zones, and carrier data undergo additional QA
Format normalization: All fields cleaned, standardized, and validated before release

Accuracy considerations: While NANPA assignment data is definitive, some fields reflect point-in-time snapshots. Carrier assignments can change (especially with number portability), and new NPA-NXX blocks are issued monthly. Our quarterly updates keep you current within a 3-month window, which is sufficient for most business applications.

Bottom line: For NPA-NXX assignments, geographic locations, and rate center data, this is the most authoritative source available outside of direct carrier records.

The NXXUseType field (L=Landline, W=Wireless) is derived from NANPA's official assignments and reflects the original carrier type when the NPA-NXX block was assigned. This data is accurate at the block level.

Important caveats:

Number portability: Individual phone numbers may have moved between carriers/types since the original assignment. A "wireless" block may contain ported landline numbers and vice versa.
VoIP complexity: Modern VoIP services blur the line between traditional categories
Statistical reliability: While not 100% accurate at the individual number level, the classification is highly reliable for aggregate analysis

Best uses:

Statistical analysis: Market research, trend analysis, demographic studies
Initial classification: First-pass filtering before deeper validation
Risk scoring: Wireless numbers have different fraud profiles than landlines
Marketing compliance: TCPA regulations treat wireless differently

For critical applications requiring definitive real-time wireless/landline identification (like TCPA compliance), consider supplementing with a real-time lookup service that checks current line type and portability status.

Rate centers are geographic boundaries originally created to determine local calling areas and billing zones. Each NPA-NXX is assigned to a specific rate center, which defines its "home" location within the telephone network.

Why rate centers still matter:

E911 emergency routing: Rate centers help determine which emergency dispatch center receives calls
Network infrastructure: Telecom equipment and switches are organized by rate center
Regulatory compliance: Many telecom regulations reference rate center boundaries
Least-cost routing: Call routing systems use rate centers to optimize routing paths
Geographic precision: Rate centers provide finer geographic granularity than area codes alone

Common applications:

Toll-free routing (route 1-800 calls to nearest rate center)
Service area mapping (define coverage by rate center)
Network planning (understand infrastructure distribution)
Historical analysis (rate centers are stable over time)

Available in: Deluxe edition only. Standard edition does not include rate center assignments.

The Status field indicates whether an NPA-NXX combination is currently in service:

"Active": The code is currently assigned and in use for telephone services
"Inactive": The code is reserved for future use or returned to the available pool

Why we include inactive records:

Historical analysis: Track how number assignments change over time
Data continuity: Maintain consistent record counts across updates
Fraud detection: Old/inactive codes being used can signal spoofing
Migration planning: Understand what codes are being phased out

Best practices:

For production routing/validation: Filter to Status='Active' only
For analytics: Include both active and inactive for complete historical view
For fraud detection: Flag calls from inactive NPA-NXX as suspicious

Available in: Deluxe edition only. Standard edition does not include status tracking.

OCN (Operating Company Number) is a unique 4-character identifier assigned by NECA (National Exchange Carrier Association) to each telecommunications carrier. The Company field shows the human-readable carrier name.

Key differences:

Attribute	OCN	Company Name
Format	4 characters (e.g., "9206")	Variable text (e.g., "Verizon New Jersey, Inc.")
Uniqueness	One OCN = One carrier entity	Names may have variations
Stability	Rarely changes	Can change with rebranding
Best for	Database keys, joins, matching	User display, reporting

Practical usage:

Use OCN for programmatic matching: If you're joining with other datasets or building database relationships, OCN is more reliable than name matching
Use Company Name for display: Show the readable name to end users in reports and interfaces
Index both fields: OCN for exact lookups, Company for text searches

Example: Verizon has multiple OCNs for different regions (9206 for New Jersey, 9740 for Pennsylvania). OCN distinguishes these entities while company names might appear similar.

Every purchase includes all three formats at no additional cost:

CSV (Comma-Separated Values): Universal format compatible with virtually any application. Perfect for importing into databases, spreadsheets, or custom applications. Standard: 19MB (~3MB compressed). Deluxe: 110MB (~9.5MB compressed).
TAB (Tab-Delimited): Alternative delimiter format useful when data contains commas. Same size as CSV.
MDB (Microsoft Access): Ready-to-use Access database with tables, relationships, and indexes already configured. Standard: 72MB (~7.5MB compressed). Deluxe: 72MB (~21.5MB compressed).

Database compatibility:

MySQL: Use LOAD DATA INFILE for fast CSV imports
PostgreSQL: Use COPY command for efficient bulk loading
SQL Server: Use BULK INSERT or Import/Export Wizard
Oracle: Use SQL*Loader or external tables
SQLite: Use .import command

All formats contain identical data-choose based on your import workflow and tooling preferences. Download all three formats if you want flexibility.

Yes! For validation of area code + exchange (first 6 digits), this database is perfect. Simply extract the first 6 digits (NPA-NXX) from any phone number and look it up.

What you can validate:

Format validity: Is this a valid NPA-NXX combination?
Geographic location: What state/city does this number belong to?
Service type: Is it likely wireless or landline? (Deluxe only)
Carrier information: Which carrier owns this block? (Deluxe only)
Time zone: What time zone is this number in? (Deluxe only)
Assignment status: Is this an active or retired block? (Deluxe only)

Validation example:

Phone: (212) 555-1234
Extract: 212555
Lookup: NPA=212, NXX=555
Result: Valid block, New York City, Landline, Verizon

Important limitations:

This validates the block assignment, not individual number activation
Just because an NPA-NXX exists doesn't mean every number in that block is active
For line-level validation ("is 212-555-1234 currently working?"), you need real-time carrier lookup services

Performance: With proper database indexing on NPANXX or (NPA, NXX) columns, lookups complete in milliseconds. Perfect for real-time validation in web forms or batch processing millions of records.

Yes! Our data works with any system that can import CSV, TAB, or MDB files. The data is normalized, consistently formatted, and ready for production use.

Common integration patterns:

Direct database import: Load into MySQL, PostgreSQL, SQL Server, Oracle, or any SQL-compatible database
CRM enrichment: Append carrier and location data to existing customer phone number records via JOIN on extracted NPA-NXX
API wrapper: Import into your database and expose via REST API for application consumption
ETL pipelines: Use tools like Talend, Informatica, Apache Airflow, or custom scripts for automated quarterly updates
Spreadsheet analysis: Import CSV directly into Excel or Google Sheets for ad-hoc analysis

Integration example (SQL):

-- Enrich customer table with area code data
UPDATE customers c
JOIN npanxx n ON SUBSTRING(c.phone, 1, 6) = n.NPANXX
SET c.phone_state = n.State,
    c.phone_timezone = n.TimeZone,
    c.phone_carrier = n.Company;

Implementation time: Most customers complete initial integration in under a day. The standardized format eliminates parsing complexity.

Bonus: Many customers combine our Area Code Database with our ZIP Code Database for complete geographic and demographic intelligence-join on the ZIP code field to enrich phone data with Census information and precise coordinates.

We offer two update delivery methods for your convenience:

1. Automated FTP/SFTP/FTPS (Recommended for production):

Free access provided to all customers-just email us your preferred username
Files published mid-quarter (January, April, July, October)
Set up scheduled tasks/cron jobs to download and import automatically
Best practice: Schedule imports for a few days after the typical release window to ensure you capture the final version

2. Manual download from your account:

Log in anytime at your account homepage to download the latest version
Ideal for development environments or occasional updates
Email notifications sent when new releases are available

Update strategy recommendations:

Full replacement method (recommended): Most customers replace the entire table quarterly. Simplest approach with lowest risk of sync errors. Each release is a complete dataset-not incremental deltas.

Zero-downtime updates: Use database table swapping techniques for production environments:

-- MySQL example
RENAME TABLE 
  npanxx_active TO npanxx_backup,
  npanxx_new TO npanxx_active;

Always keep backups: Retain at least the previous quarter's data before importing new updates

Import tips: Use your database's native CSV import tools (MySQL's LOAD DATA INFILE, PostgreSQL's COPY, SQL Server's BULK INSERT). The CSV format is standardized and imports cleanly into all major databases. Index on NPANXX, NPA, NXX, State, and ZipCode fields for optimal query performance.

It depends on how you're using the data:

Standard subscription is sufficient if you're:

Using the data internally within your company
Building applications for your own use
Providing services to clients where the data remains on your servers
Creating internal tools, reports, or analytics

You need a redistribution license if you're:

Embedding data in commercial software that you sell or distribute to customers
Providing the raw data files to clients or partners
Building SaaS applications where customers can download or export the data
Reselling or sublicensing the data in any form
Including data in mobile apps distributed via app stores

Redistribution license benefits:

Unlimited royalty-free distribution within your products
Data must be encrypted or embedded (no raw CSV/TAB/MDB distribution)
1-year term, renewable annually
Standard: $1,249.95/yr | Deluxe: $2,249.95/yr

Still unsure? Contact us with your use case-we'll help determine which license type you need. We want you to use the data confidently and compliantly.

We offer a 30-day, no-questions-asked money-back guarantee. If the data doesn't meet your needs for any reason, just contact us within 30 days of purchase for a full refund.

Why we're confident offering this:

Our data is derived from official NANPA sources-the same data carriers use
23 years in business serving Fortune 500 companies and developers
Transparent data explorer lets you examine actual records before purchasing
Comprehensive documentation so you know exactly what you're getting

No risk, no hassle. We stand behind our data quality because we know it works. Try it risk-free and see for yourself why thousands of customers trust ZIP-Codes.com for their telecom data needs.

While NANPA provides raw assignment files for free, our database offers production-ready enhancements that save you significant time and effort:

Feature	Free NANPA Files	Our Database
Data Format	Pipe-delimited text files requiring custom parsing	Clean CSV, TAB, and MDB formats-import in minutes
ZIP Code Correlations	Not provided	ZIP code matching with frequency rankings and population data
Geographic Enrichments	Basic assignment data only	Coordinates, time zones, DST flags, county data, MSA/CBSA mapping (Deluxe)
Maintenance	You download, process, normalize, and QA every quarter	We handle all updates, corrections, quality assurance, and formatting
Data Cleaning	Raw data with inconsistencies	Normalized, validated, and production-ready
Historical Tracking	Current snapshot only	Status tracking (Active/Inactive), version history, change documentation
Support	No implementation help	Email and phone support for integration questions
Delivery	Manual download from government site	Instant download + optional automated FTP/SFTP delivery

Time savings: Most customers report saving 8-12 hours per quarter compared to processing NANPA files manually. That's parsing pipe-delimited formats, handling encoding issues, normalizing carrier names, adding geographic references, validating data integrity, and building import scripts.

The bottom line: NANPA data is authoritative, but it's raw infrastructure data designed for carriers, not developers. We transform it into production-ready intelligence with the enrichments and formatting your applications actually need.

Your choice: Spend hours every quarter wrestling with government data formats, or spend $249-$449 annually and focus on building your application. Explore our live data to see the difference.

Decades of Trust: We're the ZIP Code Data Experts

Our Experts

James Harris

Lead Data Architect - 23 Years Experience

Good data doesn't just happen - it takes real people who care about getting things right. James and our team manually verify every source. No running scripts and calling it done. We maintain high standards because you're counting on this data to run your business.

When something doesn't look right, we dig into it. That's the difference experience makes.

More About Our Team →

We Stand Behind Our Work

Our mission: Provide the most accurate, comprehensive, and trustworthy ZIP Code data in the industry - so you can make confident business decisions based on reliable intelligence.

Since 2003, we have maintained 99.9% accuracy through rigorous verification, expert curation, and committment to data quality.

We believe that good data matters, and so does good service. When you need help, you'll talk to an actual person - not a ticket system or an endless email thread. Call us and we'll pick up the phone. Email us, and we will respond promptly. It's a simple thing, but it makes a difference when you're on a deadline or troubleshooting an issue.

Learn Why Many Place Their Trust In Us →

Trusted by Thousands of Companies

Our Customers say it best!

Actual customer emails from verified purchases.

★★★★★ 4.9 out of 5 from 500+ verified customers

100% Verified Reviews

6 Fortune 500 Clients

10-20+ Year Customers

Verified Purchase Customer Since 2005

★★★★★

"Thank you so much - this is pretty close to what I expected and EXACTLY what I need for both my internal customer and my Tech partner. I apologize for asking you to lap the same block several times. Please let me know if ever I can return the favor."

Bob S.

Enterprise Reference Data Team, Data Management & Insights
Wells Fargo Company Fortune 500 Company

February 20, 2023 | 20+ Year Customer | Order #14722

Verified Purchase Customer Since 2010

★★★★★

"Thanks very much Jennifer for getting back to me so quickly."

Nancy E. B., Ph.D.

Sr. Director, Data Acquisition & Data Analytics
Equifax Inc. Fortune 500 Company

May 14, 2024 | 15+ Year Customer | Order #45286

Verified Purchase @wellsfargo.com Verified

★★★★★

"Thank you for checking on this for me! You've been SO helpful each and every time (year) we've had issues."

Steve P.

Application Programmer Analyst, Enterprise Risk Management
Wells Fargo Fortune 500 Company

January 28, 2023 | Repeat Customer

Verified Purchase Customer Since 2010

★★★★★

"Thanks for your quick response to this inquiry. Can you provide a W9. I forgot to ask first time around. Thanks again for your help with this."

Denny M.

Senior Technical Product Owner
U.S. Bank Fortune 500 Company

November 25, 2024 | 15+ Year Customer | Order #42225

Verified Purchase Email Verified

★★★★★

"I had an extremely gratifying interaction with your programmer James who, on very short notice, went beyond the call of duty to make a modification which made my use of your tool much more valuable. James' courteous and efficient service today has earned my loyalty to Zip-Codes.com."

Daniel C., M.P.H., Ph.D.

Department of Pediatrics, School of Medicine, Wayne State University
Major Research University

March 15, 2023 | 11+ Year Customer | Order #73637

Verified Purchase Customer Since 2009

★★★★★

"Thank you very much for such a quick response to our needs. Please pass along my sincere gratitude to your team."

Yutthichai (U.T.)

Senior Applications Developer
The JASON Project - National Geographic Society World-Renowned Organization

February 6, 2024 | 16+ Year Customer | Order #33542

Verified Purchase Email Verified

★★★★★

"I appreciate the quick turn around on this question. We wanted to create the same reporting level in-house with your up to date ZIP Code products. These additional codes will be very helpful. This level of service makes me glad we chose to do business with your company."

Scott

Data Analyst, Abbott Laboratories Fortune 500 Company

June 18, 2021 | Customer Since 2020 | Order #179374

Verified Purchase Customer Since 2006

★★★★★

"I rarely write to applaud a product, but the usefulness of your software to my job is very relevant. Your ZIP Code software, used in conjunction with your radius finder is excellent-simple to use and a valuable resource for any direct mail marketer."

Fred

Direct Mail Marketing Manager
Westgate Resorts Major Resort Company

August 22, 2023 | 19+ Year Customer | Order #19520

Verified Purchase Customer Since 2012

★★★★★

"Thank you very much for your quick response. We look forward to working with your data and are gratified to see that your customer service is at such a high level."

Sue

Senior Analyst
Experian Automotive Global Data & Analytics Leader

September 20, 2023 | 13+ Year Customer | Order #58722

Verified Purchase Customer Since 2005

★★★★★

"Thank you Jennifer! You guys have been great to work with."

Deonte G.

IT Strategic Sourcing & Procurement Analyst
Farmers Insurance Fortune 500 Company

September 12, 2022 | 20+ Year Customer | Order #13953

See more Reviews on Google |

Area Code (NPA-NXX) Database

Choose the Right Edition for Your Project

Standard

Deluxe MOST POPULAR

Quality Data with Premium Features:

Technical Specifications at a Glance

Data Coverage

File Formats

Delivery

Performance

Field Comparison by Edition

Standard Edition - 8 Core Fields

Core Identifiers

Geographic Data

Telecom Infrastructure

Deluxe Edition - All Standard Fields + 19 more (27 Total)

Precise Location

Time & Service

Carrier Intelligence

Geographic Codes

Explore a Live Sample with our Data Explorer

Loading Area Code Database Sample

What You'll See:

Interactive Features:

Common Use Cases & Applications

Call Routing Systems

Fraud Detection & Security

Number Validation

CRM Data Enrichment

Time Zone & Scheduling

Telecom Analytics

E911 Emergency Services

Marketing Compliance (TCPA)

Geographic Targeting

Integration Examples

Python: Validate Phone Number with NPA-NXX Lookup

PHP: Validate Phone Number with NPA-NXX Lookup

Node.js: Validate Phone Number with NPA-NXX Lookup

SQL: Validate Phone Number with NPA-NXX Lookup

C# / .NET: Validate Phone Number with NPA-NXX Lookup

Java: Validate Phone Number with NPA-NXX Lookup

Need more examples?

Frequently Asked Questions

What's the difference between Standard and Deluxe editions?

What is an NPA-NXX and why do I need this data?

How do the quarterly updates work?

Can I upgrade from Standard to Deluxe later?

What's included in my subscription?

How accurate are the ZIP code correlations?

How accurate is your data?

How reliable is the Wireless/Landline (NXXUseType) classification?

What are rate centers and why do they matter?

What does "Active" vs "Inactive" status mean?

What's the difference between OCN and Company Name?

What file formats are available?

Can I use this database for bulk phone number validation?

Can I integrate this with my existing CRM or database system?

What's the best way to keep my database synchronized with quarterly updates?

Do I need a redistribution license?

What's your refund policy?

How is this different from free NANPA downloads?

Decades of Trust: We're the ZIP Code Data Experts

Our Experts

We Stand Behind Our Work

Trusted by Thousands of Companies

Our Customers say it best!

Sources & References

ZIP Code Database Business