Morton County, North Dakota
Morton County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 33,291, and was estimated to be 34,601 in 2025, making it the sixth-most populous county in North Dakota. The county seat and the largest city is Mandan, the eighth-largest city in North Dakota.
Morton County is included in the Bismarck metropolitan area.