Belle Plaine is a city in Benton County, Iowa, United States. The population was 2,330 at the 2020 census. It is part of the Cedar Rapids Metropolitan Statistical Area.

Benton County is a county in the U.S. state of Iowa. As of the 2020 census, the population was 25,575. Its county seat and largest city is Vinton. The county is named for Thomas Hart Benton, a U.S. Senator from Missouri.