ZIP Codes of Mason County, MI

Population & People
Population & People
Total Population
28,704
Household Income
Household Income
Median Income
$69,361
Housing
Housing
Total Housing Units
17,234
Business & Economy
Business & Economy
Total Businesses
734
Employment
Employment
Employment Rate
51.81%
Education
Education
Bachelor's Degree+
26.02%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 7 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:7 ZIP Codes (6 Standard, 1 PO Box, 0 Unique) [See All]
Area Code:231
Timezone:Eastern (GMT -05:00)
Local Time:2:12:33 PM
Population:28,704 [See All]
FIPS:26105
CBSA:Ludington, MI
Land Area:541 sq mi
Water Area:26 sq mi
Coordinates:43.9768, -86.1883
Quick Link:
https://www.zip-codes.com/county/mi-mason.asp
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Michigan's #50 most populous county
28,704 residents across 7 ZIPs — #50 of 83 Michigan counties.

Standout ZIPs in this County


Most Populous
Ludington · 17,184 people
59.9% of county total
Highest Income
Walhalla · $113,077 median
1.6× county average
Largest Land Area
Branch · 141.5 sq mi
Spans the most ground
Fastest Growth
Free Soil · 16.5% (10-yr)
1,458 → 1,698 residents
Most Educated
Ludington · 31.3% bachelor's+
4,040 of 12,906 adults 25+

Things worth knowing about Mason County


28,704 residents live across 7 ZIPs covering 541 sq mi, served by 7 distinct USPS-recognized cities.

Population moved from 28,126 to 28,704 from 2014 to 2024 — a +2.1% change. 6 ZIPs gained residents, 1 lost.

The county's wealthiest ZIP 49458 (Walhalla, $113,077 median) and poorest ZIP 49402 (Branch, $51,324) are 4.2 miles apart — a 2.2× income gap across local geography.

Median home values vary 4.1× across this county — from $57,800 in 49458 (Walhalla) to $239,400 in 49411 (Free Soil).

Density varies 17× across the county — from 10 people/sq mi in 49402 (Branch) to 167 in 49431 (Ludington).

Educational attainment ranges from 15.9% bachelor's+ in 49410 (Fountain) to 31.3% in 49431 (Ludington) — the breadth of educational profiles across the area.

Within Michigan, this is the #50 most populous of 83 counties and ranks #34 for median household income .

Weighted by population, the typical household earns about $64,675 across the county — reflecting what a typical resident sees, not a simple ZIP average.

26.0% of adults age 25+ hold a bachelor's degree or higher (5,507 of 21,163 reporting).

6 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Mason County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
541
square miles
Avg density
53.1
people per sq mi
Population
28,704
across 7 ZIPs
Branch
141.5 sq mi
1,411 residents
Free Soil
110.8 sq mi
1,698 residents
Ludington
103.0 sq mi
17,184 residents

All ZIP Codes in Mason County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
49431LudingtonStandard17,184$66,336103.01.2%
49454ScottvilleStandard4,873$61,28073.14.2%
49410FountainStandard1,734$61,51537.3-17.0%
49411Free SoilStandard1,698$61,857110.816.5%
49405CusterStandard1,635$70,13975.19.7%
49402BranchStandard1,411$51,324141.53.3%
49458WalhallaPO Box169$113,0770.0191.4%

Adjacent & Nearby Counties