Cedar Rapids is a city in Linn County, Iowa, United States, and the county seat. The population was 137,710 at the 2020 census, and was estimated at 137,904 in 2024. making it the second-most populous city in Iowa. The city lies on both banks of the Cedar River, 20 miles (32 km) north of Iowa City and 128 miles (206 km) northeast of Des Moines, the state's capital.