Clayton County
Also known as Clayton County, Iowa, Clayton County, IA
county in Iowa, United States
Key facts
- Country
- United States
- State
- Iowa
- Founded
- December 21, 1837
- Named after
- John M. Clayton
- Seat
- Elkader
- Largest city
- Guttenberg
- Total
- 792.631 sq mi (2,052.90 km )
- Land
- 778.464 sq mi (2,016.21 km )
- Water
- 14.167 sq mi (36.69 km ) 1.79%
- Estimate 2025
- 16,845
- Density
- 21.893/sq mi (8.4530/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
~7 min read
Article
Clayton County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 17,043, and was estimated to be 16,845 in 2025. The county seat is Elkader and the largest city is Guttenberg.
History