Benson is a city in Swift County, Minnesota, United States, along the Chippewa River. The population was 3,480 at the 2020 census. It is t…Benson is a city in Swift County, Minnesota, United States, along the Chippewa River. The population was 3,480 at the 2020 census. It is the county seat. Benson was platted in 1870 when the railroad was extended to that point. As the end of the tracks, Benson became a lively trading center. Benson was the market for a 100-mile area in almost all directions.