Washtenaw County Flag

Washtenaw County

State:
Michigan
County Seat:
Ann Arbor

Washtenaw County's estimated 2025 population is 377,352 with a growth rate of 0.93% 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 9.07% since that time.

377,352
Total Population
534
Population Density (mi²)
6
Population Rank (State)
3.5K 0.93%
Annual Population Growth

Washtenaw County Population

Demographics

Economics and Income Statistics

Sources

  1. City and Town Population Totals: 2020-2024
  2. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  3. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  4. American Community Survey (2009 - 2013)
  5. Census QuickFacts
  6. Historical Populations of States and Counties (1790 - 1990)