County Maps US

Sheridan County, Montana

A county in Montana, ranked 41 of 56 by population.

CountyFIPS 30091

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

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Population
3,436
-104 (-2.9%) since 2020
Land area
1,677
square miles. A further 1.7% of the total area is water
Population density
2.1
people per square mile, computed rather than published
County seat
Plentywood
Seat of county government.
Established
1913
112 years ago
Largest city
Plentywood city
Population 1,619.

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 Sheridan 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 Sheridan County, Montana 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 739 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 Sheridan County ranks

Position among the 56 counties of Montana, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn MontanaNationally
Population3,43641st of 562,925th of 3,144
Land area1,677 sq mi41st of 56359th of 3,144
Population density2.1 per sq mi34th of 562,985th of 3,144
Median household income$70,14720th of 561,187th of 3,143

Full data for Sheridan County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population3,436Vintage 2025 Population Estimates
Population in 20203,540Vintage 2025 Population Estimates
2020 estimates base?3,547Vintage 2025 Population Estimates
Land area1,677 sq mi2025 Gazetteer Files
Water area29.0 sq mi2025 Gazetteer Files
Total area1,706 sq mi2025 Gazetteer Files
Population density?2.1 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$70,147American Community Survey 2020-2024 5-Year Estimates
Median home value$124,000American Community Survey 2020-2024 5-Year Estimates
Median age43.1American Community Survey 2020-2024 5-Year Estimates
Households1,476American Community Survey 2020-2024 5-Year Estimates
Housing units2,041American 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
-28
24 births, 52 deaths
Net migration
-13
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 4 areas bordering Sheridan 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
Roosevelt CountyMontana55 mi10,242
Daniels CountyMontana34 mi1,612
Divide CountyNorth Dakota25 mi2,110
Williams CountyNorth Dakota17 mi41,767

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

All 56 counties of Montana

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

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