Washington County, Iowa

Washington County
Washington County Courthouse
Location within the U.S. state of Iowa
Iowa's location within the U.S.
Coordinates: 41°20′05″N 91°43′11″W / 41.334722222222°N 91.719722222222°W / 41.334722222222; -91.719722222222
Country United States
State Iowa
FoundedJanuary 18, 1838
Named afterGeorge Washington
SeatWashington
Largest cityWashington
Area
  Total
571 sq mi (1,480 km2)
  Land569 sq mi (1,470 km2)
  Water2.1 sq mi (5 km2)  0.4%
Population
 (2020)
  Total
22,565
  Estimate 
(2024)
22,631
  Density39.8/sq mi (15.4/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district2nd
Websitewashingtoncounty.iowa.gov

Washington County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 22,565. The county seat is Washington. Washington County is included in the Iowa City metropolitan area.