Treasure County, Montana

A county in Montana, ranked 55 of 56 by population.

CountyFIPS 30103Sparse data

Within Montana

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

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Population: 728; -30 (-4.0%) since 2020
Land area: 977.8; square miles. A further 0.7% of the total area is water
Population density: 0.75; people per square mile, computed rather than published
County seat: Hysham; Seat of county government.
Established: 1919; 106 years ago
Largest city: Hysham town; Population 262.

Satellite view

Aerial imagery of Treasure 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 Treasure 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 731 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 Treasure 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	728	55th of 56	3,123rd of 3,144
Land area	977.8 sq mi	53rd of 56	709th of 3,144
Population density	0.75 per sq mi	49th of 56	3,098th of 3,144
Median household income	$67,917	24th of 56	1,346th of 3,143

Full data for Treasure 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	728	Vintage 2025 Population Estimates
Population in 2020	758	Vintage 2025 Population Estimates
2020 estimates base?	760	Vintage 2025 Population Estimates
Land area	977.8 sq mi	2025 Gazetteer Files
Water area	6.6 sq mi	2025 Gazetteer Files
Total area	984.4 sq mi	2025 Gazetteer Files
Population density?	0.75 per sq mi	Computed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income	$67,917	American Community Survey 2020-2024 5-Year Estimates
Median home value	$230,300	American Community Survey 2020-2024 5-Year Estimates
Median age	52.0	American Community Survey 2020-2024 5-Year Estimates
Households	360	American Community Survey 2020-2024 5-Year Estimates
Housing units	460	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: -4; 3 births, 7 deaths
Net migration: -3; 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 3 areas bordering Treasure 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
Rosebud County	Montana	81 mi	8,253
Yellowstone County	Montana	48 mi	172,692
Big Horn County	Montana	40 mi	12,752

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.