Morton County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 33,291, making it the sixth most populous county in North Dakota. Its county seat is Mandan. Morton County is included in the Bismarck, ND, Metropolitan Statistical Area.

Mandan is a city on the eastern border of Morton County and the eighth-most populous city in North Dakota. Founded in 1879 on the west side of the upper Missouri River, it was designated in 1881 as the county seat of Morton County. The population was 24,206 at the 2020 census. Across the Missouri River from Bismarck, Mandan is a core city of the Bismarck–Mandan Metropolitan Statistical Area.