County Maps US

Richland County, Montana

A county in Montana, ranked 20 of 56 by population.

CountyFIPS 30083

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

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Population
11,377
-150 (-1.3%) since 2020
Land area
2,085
square miles. A further 0.9% of the total area is water
Population density
5.5
people per square mile, computed rather than published
County seat
Sidney
Seat of county government.
Established
1914
111 years ago
Largest city
Sidney city
Population 6,217.

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 Richland 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 Richland 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 795 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 Richland 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
Population11,37720th of 562,327th of 3,144
Land area2,085 sq mi32nd of 56271st of 3,144
Population density5.5 per sq mi17th of 562,746th of 3,144
Median household income$73,08412th of 56965th of 3,143

Full data for Richland County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population11,377Vintage 2025 Population Estimates
Population in 202011,527Vintage 2025 Population Estimates
2020 estimates base?11,488Vintage 2025 Population Estimates
Land area2,085 sq mi2025 Gazetteer Files
Water area18.9 sq mi2025 Gazetteer Files
Total area2,103 sq mi2025 Gazetteer Files
Population density?5.5 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$73,084American Community Survey 2020-2024 5-Year Estimates
Median home value$263,000American Community Survey 2020-2024 5-Year Estimates
Median age38.4American Community Survey 2020-2024 5-Year Estimates
Households4,422American Community Survey 2020-2024 5-Year Estimates
Housing units5,610American 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
+30
130 births, 100 deaths
Net migration
+282
More people moved in than moved out.

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

The 6 areas bordering Richland 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 CountyMontana92 mi10,242
Dawson CountyMontana68 mi8,692
McKenzie CountyNorth Dakota41 mi15,192
McCone CountyMontana21 mi1,720
Wibaux CountyMontana21 mi885
Williams CountyNorth Dakotaa single point41,767

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.