My Local Guide

Rolling Hills Between Two River Boundaries

Morton County, North Dakota

Morton County extends west from Mandan across rolling agricultural terrain, with the Missouri River along its eastern boundary. The Cannonball River follows part of the southern edge. Communities including New Salem, Hebron, and Glen Ullin add local centers beyond the county seat and the Bismarck metropolitan connection. The U.S. Census Bureau estimated 34,601 residents in Morton County, North Dakota, on July 1, 2025.

Morton County at a Glance

Population34,601 (July 1, 2025 Census estimate)
County SeatMandan
Established1873 (created); 1878 (organized)
Total Area, Including Water1,945.167 square miles, including water (2020 Census geography)
Major RoutesInterstate 94
Area Codes701
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Morton County
Discover Morton County

Morton County

Morton County was created in 1873 and organized in 1878, two different milestones in its governmental history. Mandan became its county seat. The Missouri River forms the eastern boundary, while the Cannonball River follows part of the south. These waterways frame a county of rolling hills, drainage valleys, and agricultural land. Its place in the Bismarck metropolitan area is only one layer of an identity that also includes several separate towns farther west.

Mandan provides the principal urban reference point, with New Salem, Hebron, Glen Ullin, Flasher, and Almont adding other community centers. Travel across the county moves beyond the Missouri River corridor into a wider rural landscape. Planning around a particular town helps make that scale more manageable. The relationship between river valleys and rolling agricultural ground is a useful theme for understanding the county as a whole rather than only its metropolitan edge.

What Shapes Us

Local Character

Morton County extends west from Mandan across rolling agricultural terrain, with the Missouri River along its eastern boundary. The Cannonball River follows part of the southern edge.

Community History

Morton County was created in 1873 and organized in 1878, two different milestones in its governmental history. Mandan became its county seat.

Around the County

Mandan provides the principal urban reference point, with New Salem, Hebron, Glen Ullin, Flasher, and Almont adding other community centers.

West of the river, each town adds perspective.
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County Resources

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Get to Know Morton County

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Local Questions

Morton County Questions, Answered

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34,601 (July 1, 2025 Census estimate). This is a dated Census Bureau estimate, rather than a live resident count.

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