Slope County, North Dakota

Slope County, North Dakota
Location within the U.S. state of North Dakota
Coordinates: 46°26′45″N 103°27′45″W / 46.445834°N 103.462462°W / 46.445834; -103.462462
Country United States
State North Dakota
FoundedNovember 3, 1914 (created)
January 14, 1915 (organized)
SeatAmidon
Largest cityMarmarth
Area
 • Total
1,219.504 sq mi (3,158.50 km2)
 • Land1,215.264 sq mi (3,147.52 km2)
 • Water4.240 sq mi (10.98 km2)  0.35%
Population
 (2020)
 • Total
706
 • Estimate 
(2024)
660 
 • Density0.543/sq mi (0.210/km2)
Time zoneUTC−7 (Mountain)
 • Summer (DST)UTC−6 (MDT)
Area code701
Congressional districtAt-large
Websiteslopecountynd.gov

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 660 in 2024, 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.