Slope County Map, North Dakota

Written and Fact-checked by | Updated On: May 31, 2026

Map of Slope County - Slope County is a county located in the U.S. state of North Dakota. Slope County Map showing cities, highways, important places and water bodies. Get Where is Slope County located in the map, major cities in Slope county, population, areas, and places of interest.

Map of Slope County, North Dakota

Map of Slope County, North Dakota

About Slope County Map, North Dakota: The map showing the county boundary, county seat, major cities, highways, water bodies and neighbouring counties.

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About Slope County, North Dakota

Slope County is a county located in the U.S. state of North Dakota. It's county seat is Amidon. As per 2020 census, the population of Slope County is 690 people and population density is square miles. According to the United States Census Bureau, the county has a total area of 1,218 sq mi (3,155 km2). Slope County was established on 1915.

Slope County Facts

ContinentNorth America
CountryUnited States
StateNorth Dakota
County SeatAmidon
Largest City/TownMarmarth
Established1915
Total Area1,219.0 sq mi (3,157.2 sq km)
Land Area1,214.0 sq mi (3,144.3 sq km)
Water Area5.0 sq mi (13.0 sq km)
Population706 (Census 2020)
Population Density0.6 people per sq mi
Time ZoneMountain Time Zone
Major HighwaysUS Highway 12, North Dakota Highway 8, North Dakota Highway 21
Major RiversLittle Missouri River
Neighboring CountiesGolden Valley County, Billings County, Bowman County, Harding County (South Dakota)
Famous ForBadlands scenery, Little Missouri River Valley, ranching, dinosaur fossils, and wide-open prairie landscapes
Top AttractionsBurning Coal Vein Campground, Little Missouri State Scenic River, Marmarth Paleontology Sites, Amidon Petrified Wood Park, Buffalo Gap Guest Ranch Area
Official WebsiteOfficial Website

About Slope County, North Dakota

Slope County is located in the southwestern corner of North Dakota and was established in 1915. The county seat is Amidon, while Marmarth is the largest community. The county lies within the rugged North Dakota Badlands and features rolling prairies, buttes, river valleys, and extensive ranchland. Slope County is one of the least populated counties in the state and is known for its natural beauty, fossil discoveries, and outdoor recreation opportunities.

Cities and Towns in Slope County, North Dakota

City/TownPopulation (Census 2020)Latitude & Longitude
Amidon (county seat)2046.4816°N, 103.3218°W
Marmarth10146.2944°N, 103.9202°W

Best Golf Courses in Slope County, North Dakota

Golf CourseLocationLatitude & Longitude
Marmarth Golf CourseMarmarth46.3001°N, 103.9278°W

What are Major Roads and Highways in Slope County

Major highways connect the county to nearby regions and cities.

  • US Highway 12 - major east-west route connecting Marmarth with Bowman and communities in Montana and South Dakota
  • North Dakota Highway 8 - north-south route connecting Amidon with Bowman County and central North Dakota
  • North Dakota Highway 21 - scenic route serving the county seat and connecting ranching communities
  • County roads provide access to ranches, recreation areas, and Badlands landscapes

Neighboring Counties of Slope County

  • Billings County (north)
  • Golden Valley County (northwest)
  • Bowman County (east)
  • Harding County, South Dakota (south)

What are Top Attractions in Slope County, North Dakota

The county offers a mix of natural and cultural attractions.

Main Sight NameCityFamous For
Little Missouri State Scenic RiverCountywideScenic river valley, wildlife, and outdoor recreation
Marmarth Paleontology SitesMarmarthWorld-renowned dinosaur fossil discoveries
Burning Coal Vein CampgroundNear AmidonCamping, hiking, and Badlands scenery
Amidon Petrified Wood ParkAmidonPetrified wood displays and geological features
Little Missouri River ValleyCountywideBadlands landscapes and wildlife viewing
Buffalo Gap Guest Ranch AreaNear AmidonWestern ranch experiences and horseback riding
Marmarth Railroad Depot AreaMarmarthHistoric railroad heritage
Badlands OverlooksCountywidePanoramic views of western North Dakota
Deep Creek Recreation AreaNear MarmarthFishing and outdoor recreation
Slope County MuseumAmidonLocal history and pioneer exhibits

Distance from Slope County to Nearby Cities

The following distances are measured by road (driving).

  • Amidon to Marmarth (Slope County), North Dakota - 42 mi (68 km)
  • Amidon to Bowman (Bowman County), North Dakota - 31 mi (50 km)
  • Amidon to Medora (Billings County), North Dakota - 39 mi (63 km)
  • Amidon to Beach (Golden Valley County), North Dakota - 54 mi (87 km)
  • Amidon to Dickinson (Stark County), North Dakota - 87 mi (140 km)
  • Amidon to Hettinger (Adams County), North Dakota - 58 mi (93 km)
  • Amidon to Mott (Hettinger County), North Dakota - 82 mi (132 km)
  • Amidon to New England (Hettinger County), North Dakota - 66 mi (106 km)
  • Amidon to Belfield (Stark County), North Dakota - 66 mi (106 km)
  • Amidon to Killdeer (Dunn County), North Dakota - 96 mi (154 km)
  • Amidon to Williston (Williams County), North Dakota - 188 mi (303 km)
  • Amidon to Bismarck (Burleigh County), North Dakota - 175 mi (282 km)
  • Amidon to Rapid City (Pennington County), South Dakota - 177 mi (285 km)
  • Amidon to Fargo (Cass County), North Dakota - 337 mi (542 km)
  • Amidon to Grand Forks (Grand Forks County), North Dakota - 392 mi (631 km)

References

  1. QuickFacts - Slope County, North Dakota
  2. United States Census Bureau
  3. United States Geological Survey (USGS)
  4. National Geodetic Survey
  5. Official County Website