Iowa County
Also known as Iowa County, Iowa, Iowa County, IA
county in Iowa, United States of America
Key facts
- Country
- United States
- State
- Iowa
- Founded
- February 17, 1843 (created), July 1, 1845 (organized)
- Named after
- Iowa River
- Seat
- Marengo
- Largest city
- Williamsburg
- Total
- 587.492 sq mi (1,521.60 km )
- Land
- 586.455 sq mi (1,518.91 km )
- Water
- 1.037 sq mi (2.69 km ) 0.18%
- Estimate 2025
- 16,504
- Density
- 28.411/sq mi (10.970/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
~9 min read
Article
Iowa County is a county in the U.S. state of Iowa. As of the 2020 census, the population was 16,662, and was estimated to be 16,504 in 2025. The county seat is Marengo and the largest city is Williamsburg. Iowa County is one of seven counties in the United States to share the same name as the state in which they are located. The other six counties are Arkansas County, Hawaii County, Idaho County, New York County, Oklahoma County, and Utah County.
History