County ProfileMI
Washtenaw County
Population: 372,258 · 18 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
372,258
People
Median age
35
Housing
Total households
150,550
Income
Median household income
$89,180
Housing
Total housing units
159,782
Employment
Employment rate
60.1%
Education
Bachelor’s degree or higher
58.7%
Healthcare
Insured population
96.7%
County details
Local time 01:53:21(ET)| Name | Washtenaw |
|---|---|
| Total ZIP codes | 18total |
| ZIP codes (by type) | 14 Standard4 PO Box |
| Area code | 734 |
| Timezone | Eastern Time (ET) |
| Coordinates | 42.2522168, -83.8434233 |
| Land area | 706 sq miles(1,828.6 km²) |
Map of Washtenaw county, Michigan with ZIP codes
Cities and Communities in Washtenaw County
Compare the largest cities in Washtenaw County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| Ann Arbor | 123,851 | $82,212 | 8ZIPs |
| Ypsilanti | 20,648 | $46,588 | 2ZIPs |
| Saline | 8,948 | $88,346 | 1ZIPs |
| Whitmore Lake | 7,584 | $86,779 | 1ZIPs |
| Milan | 6,079 | $96,949 | 1ZIPs |
| Chelsea | 5,467 | $72,098 | 1ZIPs |
| Dexter | 4,500 | $106,637 | 1ZIPs |
| Willis | 3,980 | — | 1ZIPs |
| Manchester | 2,037 | $87,614 | 1ZIPs |
| Whittaker | 163 | — | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in Washtenaw County
Review the most populated postal areas across Washtenaw County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 48197 | Ypsilanti | $73,737 | 67,895 |
| 48103 | Ann Arbor | $116,194 | 55,605 |
| 48104 | Ann Arbor | $64,231 | 41,588 |
| 48198 | Ypsilanti | $63,326 | 40,067 |
| 48105 | Ann Arbor | $94,774 | 38,883 |
| 48108 | Ann Arbor | $89,355 | 26,639 |
| 48176 | Saline | $114,206 | 22,833 |
| 48130 | Dexter | $129,254 | 16,469 |
| 48160 | Milan | $103,453 | 14,097 |
| 48189 | Whitmore Lake | $87,145 | 14,038 |
| 48118 | Chelsea | $88,278 | 13,309 |
| 48109 | Ann Arbor | $14,093 | 8,008 |
| 48158 | Manchester | $94,784 | 7,362 |
| 48191 | Willis | $102,833 | 3,980 |
| 48190 | Whittaker | $76,875 | 163 |
| 48106 | Ann Arbor | — | — |
| 48107 | Ann Arbor | — | — |
| 48113 | Ann Arbor | — | — |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS