Jefferson County
County in 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.... Wikipedia
Cities: Fairfield, Libertyville, Lockridge, and more
Population: 15,698 (2022)
County seat: Fairfield
Area: 437 mi²