County Maps US

Slope County, North Dakota

The least populous of North Dakota's 53 counties.

CountyFIPS 38087Sparse data

Within North Dakota
Slope County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Amidon, the county seat, located via the 2025 Census Gazetteer.

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Population
628
-69 (-9.9%) since 2020
Land area
1,215
square miles. A further 0.3% of the total area is water
Population density
0.52
people per square mile, computed rather than published
County seat
Amidon
Seat of county government.
Established
1915
110 years ago
Largest city
Marmarth city
Population 91.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Slope County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Slope County, North Dakota from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 410 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Slope County ranks

Position among the 53 counties of North Dakota, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn North DakotaNationally
Population62853rd of 533,131st of 3,144
Land area1,215 sq mi25th of 53505th of 3,144
Population density0.52 per sq mi53rd of 533,115th of 3,144
Median household income$71,25029th of 531,114th of 3,143

Full data for Slope County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population628Vintage 2025 Population Estimates
Population in 2020697Vintage 2025 Population Estimates
2020 estimates base?701Vintage 2025 Population Estimates
Land area1,215 sq mi2025 Gazetteer Files
Water area4.2 sq mi2025 Gazetteer Files
Total area1,220 sq mi2025 Gazetteer Files
Population density?0.52 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$71,250American Community Survey 2020-2024 5-Year Estimates
Median home value$170,000American Community Survey 2020-2024 5-Year Estimates
Median age54.1American Community Survey 2020-2024 5-Year Estimates
Households374American Community Survey 2020-2024 5-Year Estimates
Housing units456American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-1
3 births, 4 deaths
Net migration
-15
More people moved out than moved in.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 7 areas bordering Slope County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Bowman CountyNorth Dakota50 mi2,762
Golden Valley CountyNorth Dakota27 mi1,808
Hettinger CountyNorth Dakota24 mi2,492
Fallon CountyMontana18 mi2,959
Billings CountyNorth Dakota18 mi1,071
Stark CountyNorth Dakota14 mi34,013
Adams CountyNorth Dakota3.4 mi2,275

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 53 counties of North Dakota

Open the interactive North Dakota county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.