Jefferson County, Iowa

Jefferson County
Courthouse in Fairfield is on the NRHP
Courthouse in Fairfield is on the NRHP
Map of Iowa highlighting Jefferson County
Location within the U.S. state of Iowa
Map of the United States highlighting Iowa
Iowa's location within the U.S.
Coordinates: 41°01′53″N 91°56′41″W / 41.031388888889°N 91.944722222222°W / 41.031388888889; -91.944722222222
Country United States
State Iowa
FoundedJanuary 21, 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 
(2023)[1]
15,440 Decrease
 • Density36/sq mi (14/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district1st
Websitehttps://jeffersoncounty.iowa.gov/

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.[2] The county seat is Fairfield.[3] The county was formed in January 1839, and was named for U.S. President Thomas Jefferson.[4][5] Jefferson County comprises the Fairfield, IA Micropolitan Statistical Area.

  1. ^ "QuickFacts: Jefferson County, Iowa". Census.gov. Retrieved May 29, 2022.
  2. ^ "2020 Census State Redistricting Data". census.gov. US Census Bureau. Retrieved August 12, 2021.
  3. ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
  4. ^ Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 168.
  5. ^ Jefferson County Archived October 10, 2007, at the Wayback Machine