Jefferson County, Iowa

Jefferson County is a county located in the U.S. state of Iowa. As of the 2020 United States Census, the population was 15,663. The county seat is Fairfield. The county was formed in January 1839, and was named for U.S. President Thomas Jefferson.

Jefferson County
Courthouse in Fairfield is on the NRHP
Location within the U.S. state of Iowa
Iowa's location within the U.S.
Coordinates: 41°01′53″N 91°56′41″W
Country United States
State Iowa
Founded21 January 1839
Named forThomas Jefferson
SeatFairfield
Largest cityFairfield
Area
  Total437 sq mi (1,130 km2)
  Land436 sq mi (1,130 km2)
  Water1.4 sq mi (4 km2)  0.3%
Population
 (2020)
  Total15,663
  Estimate 
(2021)
15,647
  Density36/sq mi (14/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district2nd
Websitehttps://jeffersoncounty.iowa.gov/

Jefferson County comprises the Fairfield, IA Micropolitan Statistical Area.

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