Clark County, Idaho

The least populous of Idaho's 44 counties.

CountyFIPS 16033Sparse data

Within Idaho

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

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Population: 783; -8 (-1.0%) since 2020
Land area: 1,763; square miles. A further 0.1% of the total area is water
Population density: 0.44; people per square mile, computed rather than published
County seat: Dubois; Seat of county government.
Established: 1919; 106 years ago
Largest city: Dubois city; Population 516.

Satellite view

Aerial imagery of Clark 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 Clark County, Idaho 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 520 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 Clark County ranks

Position among the 44 counties of Idaho, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

Measure	Value	In Idaho	Nationally
Population	783	44th of 44	3,120th of 3,144
Land area	1,763 sq mi	18th of 44	340th of 3,144
Population density	0.44 per sq mi	44th of 44	3,122nd of 3,144
Median household income	$55,208	40th of 44	2,465th of 3,143

Full data for Clark 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	783	Vintage 2025 Population Estimates
Population in 2020	791	Vintage 2025 Population Estimates
2020 estimates base?	788	Vintage 2025 Population Estimates
Land area	1,763 sq mi	2025 Gazetteer Files
Water area	0.96 sq mi	2025 Gazetteer Files
Total area	1,764 sq mi	2025 Gazetteer Files
Population density?	0.44 per sq mi	Computed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income	$55,208	American Community Survey 2020-2024 5-Year Estimates
Median home value	$216,900	American Community Survey 2020-2024 5-Year Estimates
Median age	31.1	American Community Survey 2020-2024 5-Year Estimates
Households	279	American Community Survey 2020-2024 5-Year Estimates
Housing units	456	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: 0; 8 births, 8 deaths
Net migration: +1; 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 Clark 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
Beaverhead County	Montana	95 mi	10,043
Fremont County	Idaho	61 mi	14,208
Butte County	Idaho	33 mi	2,783
Jefferson County	Idaho	33 mi	35,297
Lemhi County	Idaho	19 mi	8,474

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

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