Jefferson County is a county in the U.S. state of Iowa. As of the 2010 census, the population was 16,843. The county seat is Fairfield. The county was founded in January 1839, and was named after U.S. President Thomas Jefferson.
Jefferson County is a county in the U.S. state of Iowa. As of the 2010 census, the population was 16,843. The county seat is Fairfield. The county was founded in January 1839, and was named after U.S. President Thomas Jefferson.