Enderlin is a city in Ransom and Cass Counties in the State of North Dakota. The population was 881 at the 2020 census, and was estimat…Enderlin is a city in Ransom and Cass Counties in the State of North Dakota. The population was 881 at the 2020 census, and was estimated to be 851 in 2024. Enderlin was founded on October 7, 1891. One of the oldest buildings in town, the Robert Lindemann House, was built in 1913 and is on the National Register of Historic Places.