Data Last Updated: January 1, 2025

Washtenaw County, MI ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Washtenaw, MI.	30 ZIP Codes (13 General, 6 PO Box, 0 Unique, & 11 Multi County) [More Details]
Area Code: The Telephone Area Code that are associated with Washtenaw, MI. Area Codes are used in the North American Numbering Plan (NANP) to facilitate phone routing. There are approximately 350 area codes in use in the United States.	734
Timezone: Time zone designation within the U.S. Please note that not all areas in the U.S. observe daylight saving time which can affect actual local time for this city. There are 7 standard time zones which are, from west to east: Hawaii-Aleutian, Alaska, Pacific, Mountain, Central, Eastern, Atlantic. Also included in U.S. Territories are Samoa, Guam and Palau.	Eastern
Local Time: The current local time for each timezone. If more than 1 time zone for this area, all local times will be shown. Counties can cross timezones, so more than 1 may be shown.	12:00:00 AM
Population: The population of Washtenaw, MI from the U.S. Census 2020. Included are U.S. Citizens, permanent residents, temporary migrants, and undocumented individuals. The total population represents people who live in the city, not just those present while the Census was being completed.	372,258 [More Details]
FIPS: FIPS stands for Federal Information Processing Standards, which are a set of publicly announced standards for computer systems. A county FIPS code is a unique numeric identifier for a county in the United States, assigned by the National Institute of Standards and Technology (NIST). County FIPS codes have five digits, with the first two digits identifying the state and the last 3 indicating the county.	26161
CBSA: A Core Based Statistical Area (CBSA) is the recognized term for a region that functions around an urban core with a population of at least 10,000 people, according to the standards set by the Office of Management and Budget (OMB) in 2000. A CBSA is divided into two subsets: Metro and Micro, and these classifications are determined by population density. A Micro area is identified by a population ranging between 10,000 to 50,000, while a Metro area is defined as having a population that exceeds 50,000.	Ann Arbor, MI
Land Area: The approximate amount of land area covered by Washtenaw, MI in square miles. The Land Area provided by the Census Bureau is based on geographic boundaries that include the mainland, islands, inland, coastal, Great Lakes, and territorial waters associated with each city.	706 square miles
Water Area: The approximate amount of water area covered by Washtenaw, MI in square miles. Calculations by the Census Bureau for Water Area take into account inland bodies of water, coastal regions, Great Lakes, and territorial sea waters. This encompasses features such as lakes, reservoirs, rivers, and coastal water bodies.	16 square miles
Coordinates: The latitude/longitude centroid coordinates for Washtenaw County, MI.	-83.838768, 42.253219
Quick Link: Copy the direct link to the Washtenaw, MICounty page and use anywhere you like!	https://www.zip-codes.com/county/mi-washtenaw.asp

Washtenaw, MI ZIP Code Boundaries

Download ZIP Code Database

Load Washtenaw County, MI Map

Washtenaw County, MI Covers 30 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 48103	General	Ann Arbor	55,605	14.94%
ZIP Code 48104	General	Ann Arbor	41,588	11.17%
ZIP Code 48105	General	Ann Arbor	38,883	10.45%
ZIP Code 48106	P.O. Box	Ann Arbor	0	0.00%
ZIP Code 48107	P.O. Box	Ann Arbor	0	0.00%
ZIP Code 48108	General	Ann Arbor	26,639	7.16%
ZIP Code 48109	General	Ann Arbor	8,008	2.15%
ZIP Code 48113	P.O. Box	Ann Arbor	0	0.00%
ZIP Code 48115	P.O. Box	Bridgewater	0	0.00%
ZIP Code 48118	General	Chelsea	13,309	3.58%
ZIP Code 48130	General	Dexter	16,469	4.42%
ZIP Code 48137 *	General	Gregory	4,957	--
ZIP Code 48158	General	Manchester	7,362	1.98%
ZIP Code 48160 *	General	Milan	14,097	--
ZIP Code 48167 *	General	Northville	25,071	--
ZIP Code 48168 *	General	Northville	24,517	--
ZIP Code 48169 *	General	Pinckney	20,336	--
ZIP Code 48170 *	General	Plymouth	41,069	--
ZIP Code 48175	P.O. Box	Salem	0	0.00%
ZIP Code 48176	General	Saline	22,833	6.13%
ZIP Code 48178 *	General	South Lyon	36,858	--
ZIP Code 48189	General	Whitmore Lake	14,038	3.77%
ZIP Code 48190	P.O. Box	Whittaker	163	0.04%
ZIP Code 48191	General	Willis	3,980	1.07%
ZIP Code 48197	General	Ypsilanti	67,895	18.24%
ZIP Code 48198	General	Ypsilanti	40,067	10.76%
ZIP Code 49229 *	General	Britton	3,261	--
ZIP Code 49236 *	General	Clinton	4,831	--
ZIP Code 49240 *	General	Grass Lake	9,213	--
ZIP Code 49285 *	General	Stockbridge	5,866	--

* Indicates a Multi County ZIP Code. These ZIP Codes partially cross over into Washtenaw, MI, but will mostly cover area in a different County. Not included in % of Population calculations.

Important Washtenaw, MI Information

Washtenaw County, MI Covers 30 ZIP Codes. This includes 13 General ZIP Codes, 6 PO Box ZIP Codes, and 0 Unique (reserved for Business and Volume Mail Receivers). There are also 11 Multi County ZIP Codes. These records are assigned a different primary county, but they partially cover area in Washtenaw County.

The population for Washtenaw County is 372,258, according to the U.S. Census. Population Density is 527.28 persons per square mile. With 156,882 Housing Units, the Average Household Size is 2.36 persons. There are 147,847 Family Households with an Average Family Size of 3.13 persons. 3.03% of the population is without Health Insurance. The 61.35% Employment Rate is 1.55% above the national average of 59.8%.234,731 people aged 25+ have some educational achievement, with 57.20% (or 134,255 people) having attained a Bachelor's Degree or higher.More Demographics are available below.

734 is the only area code for this area. Washtenaw is also located in the Eastern timezone and the current local time is shown above.

Washtenaw is part of the Ann Arbor, MI Core Based Statistical Area (CBSA). Its CBSA Code is 11460.It is classified as a metro area, which means the combined population is 50,000 or more (at its core).

CBSAs are defined by the OMB as geographic areas that have at least one core with a population of 10,000 or more (for a micro area) and adjacent territory with a high degree of social and economic integration. CBSA codes are commonly used to accurately file Medicare claims and to verify applicable incentives using a patient's ZIP Code.

ZIP Codes in Washtenaw, MI have 151,070 Residential mailboxes and 9,087 Business mailboxes.There are 7,986 businesses with a total of 150,281 employees. That is an average of 18.8 employees per business. Annual payroll for these businesses is $10,343,758,000. Other Demographics

Washtenaw County Demographic Profile

Population & People

Total Population

372,258

Income

Median Household Income

$79,198

Housing

Total Housing Units

156,882

Health

Without Healthcare Coverage

3.03%

Business & Economy

Total Businesses

7,986

Families

Total Households

147,847

Employment

Employment Rate

61.35%

Education

Bachelor's Degree or Higher

57.20%

Total Population: Total number of people from the 2020 U.S. Census for Washtenaw, MI. This reflects the exact count of this area at that point in time, not future estimates, regardless of citizenship or immigration status. It is intended to count all persons living within the geographic area, not just those present on the day of the census.	372,258
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Washtenaw, MI. This is derived from known delivery information, household occupancy rates, household size, and more to come up with an accurate estimation for the current population. IMPORTANT: This does not include population totals for persons in nursing homes, correctional facilities, or other institutions. This is an estimation of the household population based on US Postal Service delivery information.	353,250
Total Households: Total number of Households from the 2020 U.S. Census for Washtenaw, MI. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	147,847
Total Housing Units: The total number of Housing Units is the number of occupied units + the number of vacant units. Ownership is defined by whether the unit is occupied by an owner or by a tenant. Owner occupancy means that the owner lives in the unit. This value comes from the 2020 U.S. Census and is not a projection or estimate.	156,882
Average Household Size: The Average Household Size, is obtained by dividing the number of people in Households (excluding those in group quarters, nursing home, prisons, and dorm rooms) by the number of Households. A Household includes everyone living in a residential unit. Those who do not live in a household are classified as living in group accommodation. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	2.36
Average Family Size: Average Family Size is calculated by dividing the number of people in a Family Household by the number of Family Households. The U.S. Census Bureau defines family households as households consisting of two or more individuals who are related by birth, marriage, or adoption. They also may include other unrelated people. Non-family households consist of people who live alone or who share their residence with unrelated individuals. The Average Family Size only looks at the households classified as Family Households. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	3.13

Other Washtenaw Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	151,070
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	9,087
Total Delivery Receptacles: The total number of delivery receptacles. This includes curb side mailboxes, centralized units, PO Boxes, NDCBU, and contract boxes. This count is for Residential and Business combined.	202,406
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	90,918
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	26,847

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	7,986
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$2,425,855,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$10,343,758,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	150,281

Sum of all ZIP Codes assigned Washtenaw, MI as their primary County.

References

U.S. Postal Service [Last Updated: 1/1/2025], https://www.usps.com
ZIP-Codes.com Internal Data Creation [Last Updated: 1/1/2025], https://www.zip-codes.com
U.S. Geological Survey [Updated as needed], https://www.usgs.gov
U.S. Census [Updated Yearly], https://www.census.gov
U.S. Census 2020 [Decennial] [Last Updated: 5/25/2023], https://www.census.gov