Harrison is a village in Sioux County, Nebraska, United States. The population was 239 at the 2020 census. It is the county seat of Sioux County. Harrison was originally called Bowen, and under that name was platted in 1886, when the Fremont, Elkhorn, & Missouri Valley Railroad was extended to that point. It was renamed Harrison in 1887, in hono…Harrison is a village in Sioux County, Nebraska, United States. The population was 239 at the 2020 census. It is the county seat of Sioux County. Harrison was originally called Bowen, and under that name was platted in 1886, when the Fremont, Elkhorn, & Missouri Valley Railroad was extended to that point. It was renamed Harrison in 1887, in honor of Benjamin Harrison. Harrison was incorporated in 1889.