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.

Vinton is a city in Benton County, Iowa, United States. The population was 4,938 in the 2020 census, a decrease from 5,102 in 2000. It is also part of the Cedar Rapids Metropolitan Statistical Area. Vinton is the county seat of Benton County.