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 / 41.031388888889°N 91.944722222222°W | |
| Country |  United States |
| State |  Iowa |
| Founded | January 21, 1839 |
| Named for | Thomas Jefferson |
| Seat | Fairfield |
| Largest city | Fairfield |
| Area | |
• Total | 437 sq mi (1,130 km2) |
| • Land | 436 sq mi (1,130 km2) |
| • Water | 1.4 sq mi (4 km2) 0.3% |
| Population (2020) | |
• Total | 15,663 |
• Estimate (2023)[1] | 15,440  |
| • Density | 36/sq mi (14/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | 1st |
| Website | https://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.
- ^ "QuickFacts: Jefferson County, Iowa". Census.gov. Retrieved May 29, 2022.
- ^ "2020 Census State Redistricting Data". census.gov. US Census Bureau. Retrieved August 12, 2021.
- ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
- ^ Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 168.
- ^ Jefferson County Archived October 10, 2007, at the Wayback Machine