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About Iowa County

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.

Description adapted from Wikipedia, CC BY-SA 4.0.

Iowa County, Iowa
Iowa County Courthouse, Marengo — CC BY 2.0, cwwycoff1 · source

History of Iowa County

Iowa County was formed on February 17, 1843. It was named for the Iowa River, which flows through the county. The first courthouse was a log cabin built in 1847. It was rented by the county until 1850 when a second courthouse was completed. In 1861 construction of a third courthouse was begun. The current courthouse was built in 1892 after the county had outgrown the previous one. Iowa County is home to the Amana Colonies, a group of settlements of German Pietists comprising seven villages. Calling themselves the Ebenezer Society or the Community of True Inspiration (German: die Gemeinde der wahren Inspiration), they first settled in New York state near Buffalo in what is now West Seneca. However, in order to live out their beliefs in more isolated surroundings they moved west, to Iowa County in 1855, living a communal life until the mid-1930s.

Adapted from Wikipedia, CC BY-SA 4.0.

Iowa County at a glance

County seat
Marengo
Population
16,662 (2020)
Land area
587 sq mi
Founded
1843

Largest communities in Iowa County

  1. Troy Township 3,771
  2. Williamsburg 3,346
  3. Marengo Township 2,439
  4. Marengo county seat 2,435
  5. Lenox Township 1,818

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Official channels

Iowa County election resources

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Neighboring counties

Part of Iowa Voter Check

This is the Iowa County page of Iowa Voter Check, a project of True the Vote, pointing Iowa voters at the official tools that already exist — and at Scan Check Protect to verify your registration.

Where anything here differs from what Iowa County or the Iowa Secretary of State publishes, they are right and this page is not.