Linn County
Also known as Linn County, Iowa, Linn County, IA
county in Iowa, United States
Key facts
- Country
- United States
- State
- Iowa
- Founded
- December 21, 1837 (created), June 1, 1839 (organized)
- Named after
- Lewis F. Linn
- Seat
- Cedar Rapids
- Largest city
- Cedar Rapids
- Total
- 724.669 sq mi (1,876.88 km )
- Land
- 717.013 sq mi (1,857.06 km )
- Water
- 7.656 sq mi (19.83 km ) 1.06%
- Estimate 2025
- 232,028
- Density
- 321.192/sq mi (124.013/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
Article
Linn County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 230,299, and was estimated to be 232,028 in 2025, making it the second-most populous county in Iowa. The county seat and the largest city is Cedar Rapids. Linn County is named in honor of Senator Lewis F. Linn of Missouri. Linn County is included in the Cedar Rapids, IA Metropolitan statistical area.
History