Kanopolis is a city in Ellsworth County, Kansas, United States. As of the 2020 census, the population of the city was 443. It was built on the site of Fort Harker, a United States Army post that housed infantry and cavalry troops involved in the Indian Wars from 1867 to 1872.

Ellsworth County is a county located in the U.S. state of Kansas. Its county seat and most populous city is Ellsworth. As of the 2020 census, the county population was 6,376. The county was named after Fort Ellsworth.