Linn County, Iowa

Linn County, Iowa
The Linn County Courthouse in Cedar Rapids
Location within the U.S. state of Iowa
Coordinates: 42°04′41″N 91°35′52″W / 42.077951°N 91.597674°W / 42.077951; -91.597674
Country United States
State Iowa
FoundedDecember 21, 1837 (created)
June 1, 1839 (organized)
Named afterLewis F. Linn
SeatCedar Rapids
Largest cityCedar Rapids
Area
 • Total
724.669 sq mi (1,876.88 km2)
 • Land717.013 sq mi (1,857.06 km2)
 • Water7.656 sq mi (19.83 km2)  1.06%
Population
 (2020)
 • Total
230,299
 • Estimate 
(2024)
231,762
 • Density321.192/sq mi (124.013/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Area code319
Congressional district2nd
Websitelinncountyiowa.gov
  • Iowa county number 57

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 231,762 in 2024, 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.