Valley County, Montana

A county in Montana, ranked 29 of 56 by population.

CountyFIPS 30105

Within Montana

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

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Population: 7,385; -179 (-2.4%) since 2020
Land area: 4,926; square miles. A further 2.7% of the total area is water
Population density: 1.5; people per square mile, computed rather than published
County seat: Glasgow; Seat of county government.
Established: 1893; 132 years ago
Largest city: Glasgow city; Population 3,145.

Satellite view

Aerial imagery of Valley 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 Valley 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 657 by 800 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 Valley 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.

Measure	Value	In Montana	Nationally
Population	7,385	29th of 56	2,627th of 3,144
Land area	4,926 sq mi	6th of 56	81st of 3,144
Population density	1.5 per sq mi	40th of 56	3,026th of 3,144
Median household income	$71,695	14th of 56	1,070th of 3,143

Full data for Valley County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
Measure	Value	Source and vintage
Population	7,385	Vintage 2025 Population Estimates
Population in 2020	7,564	Vintage 2025 Population Estimates
2020 estimates base?	7,584	Vintage 2025 Population Estimates
Land area	4,926 sq mi	2025 Gazetteer Files
Water area	135.7 sq mi	2025 Gazetteer Files
Total area	5,062 sq mi	2025 Gazetteer Files
Population density?	1.5 per sq mi	Computed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income	$71,695	American Community Survey 2020-2024 5-Year Estimates
Median home value	$198,400	American Community Survey 2020-2024 5-Year Estimates
Median age	44.3	American Community Survey 2020-2024 5-Year Estimates
Households	2,951	American Community Survey 2020-2024 5-Year Estimates
Housing units	4,254	American 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: -35; 68 births, 103 deaths
Net migration: +36; 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 5 areas bordering Valley 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 area	State	Shared border	Population
Phillips County	Montana	107 mi	4,203
Garfield County	Montana	74 mi	1,148
McCone County	Montana	49 mi	1,720
Daniels County	Montana	48 mi	1,612
Roosevelt County	Montana	40 mi	10,242

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.