Washington County, Iowa

Washington County, Iowa
Location within the U.S. state of Iowa
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 (5.4 km2)  0.4%
Population
 (2020)
 • Total
22,565
 • Estimate 
(2024)
22,631
 • Density39.7/sq mi (15.3/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district1st
Websitewashingtoncounty.iowa.gov
  • Iowa county number 92

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 and the largest city is Washington. Washington County is included in the Iowa City metropolitan area.