Slope County

Also known as Slope County, North Dakota, Slope County, ND

county in North Dakota, United States

Key facts

Country: United States
State: North Dakota
Founded: November 3, 1914 (created), January 14, 1915 (organized)
Seat: Amidon
Largest city: Marmarth
Total: 1,219.504 sq mi (3,158.50 km )
Land: 1,215.264 sq mi (3,147.52 km )
Water: 4.240 sq mi (10.98 km ) 0.35%
Density: 0.543/sq mi (0.210/km )
Time zone: UTC−7 ( Mountain )
Summer dst: UTC−6 ( MDT )
Congressional district: At-large
Website

Article

Slope County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 706, and was estimated to be 628 in 2025, making it the least populous county in North Dakota and the 18th-least populous county in the United States. The county seat is Amidon and the largest city is Marmarth.

History