Correctionville is a city in Woodbury County, Iowa, United States. It is part of the Sioux City, IA–NE–SD Metropolitan Statistical Area. The population was 766 at the time of the 2020 census. The town name comes from the original survey of the town. Correctionville has been noted for its unusual place name. It is supposedly the longest single-word place name in the state of Iowa.

Woodbury County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 105,941, making it the sixth-most populous county in Iowa. The county seat is Sioux City.