COUNTY · MI
Washtenaw County, Michigan
Washtenaw County is a county in Michigan with FIPS code 26161 and an estimated population of 365,536 (Census 2023), 6th largest of 83 in the state.
County facts
- Name
- Washtenaw County
- State
- Michigan
- Type
- county
- FIPS code
- 26161
- State FIPS
- 26
- Population (2023)
- 365,536
- Change since 2020
- -1.7%
- State rank
- 6 of 83
Population is the Census Bureau’s Vintage 2023 estimate.
Major cities in Washtenaw County
Other counties in Michigan
Questions
What is the FIPS code for Washtenaw County?
Washtenaw County, Michigan has the five-digit FIPS code 26161: 26 for the state and 161 for the county.
What state is Washtenaw County in?
Washtenaw County is in Michigan.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.