Washtenaw County Flag

Washtenaw County

State:
Michigan
County Seat:
Ann Arbor

Washtenaw County's estimated 2026 population is 380,829 with a growth rate of 0.92% in the past year according to the most recent United States census data. Washtenaw County is the 6th largest county in Michigan. The 2010 population was 345,980 and has seen a growth of 10.07% since that time.

380,829
Total Population
539
Population Density (mi²)
6
Population Rank (State)
3.5K 0.92%
Annual Population Growth

Washtenaw County Population

Demographics

Economics and Income Statistics