Hamilton County
Sign in to saveAlso known as Hamilton County, Iowa, Hamilton County, IA
county in Iowa, United States
Key facts
- Country
- United States
- State
- Iowa
- Founded
- January 8, 1857
- Named after
- William W. Hamilton
- Seat
- Webster City
- Largest city
- Webster City
- Total
- 577.486 sq mi (1,495.68 km )
- Land
- 576.731 sq mi (1,493.73 km )
- Water
- 0.755 sq mi (1.96 km ) 0.13%
- Estimate 2025
- 14,944
- Density
- 26.076/sq mi (10.068/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
- Congressional district
- 4th
- Website
- hamiltoncounty.iowa.gov
via Wikipedia infobox
~8 min read
Encyclopedic overview
Hamilton County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 15,039, and was estimated to be 14,944 in 2025. The county seat and the largest city is Webster City. The county was named to honor William W. Hamilton, a President of the Iowa State Senate.
Geography
Excerpted from Wikipedia’s “Hamilton County” article, available under the CC BY-SA 4.0 licence.