Parkersburg is a city in Butler County, Iowa, United States. The population was 2,015 in the 2020 census, an increase from 1,870 in the 2010 census. Parkersburg, although not the county seat, is the highest-populated city in Butler County.

Butler County is a county located in the U.S. state of Iowa. As of the 2020 census, the population was 14,334. Its county seat is Allison. The county was organized in 1854 and named for General William O. Butler.