Washtenaw County, Michigan
Washtenaw County is a county in Michigan. Its county FIPS code is 26161. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 26161
- Representative coordinates
- 42.252217, -83.843423
- County type
- County
- County seat or government
- Ann Arbor
- Resident population, July 2025
- 370,214
- Land area
- 1,828.571 km²
- Water area
- 42.492 km²
- State
- Michigan
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in Washtenaw County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Detroit | UTC-05:00 in January; UTC-04:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
48103 · 48104 · 48105 · 48108 · 48109 · 48111 · 48118 · 48130 · 48137 · 48158 · 48160 · 48167 · 48168 · 48169 · 48170 · 48176 · 48178 · 48189 · 48190 · 48191 · 48197 · 48198 · 49229 · 49236 · 49240 · 49285 · 49287
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Use the US government local-office directory ↗ to find the office responsible for your address. A county website has not been confidently matched here. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county at your current point, check its ZIP area, or find its physical time zone.