County Dossier

Custer County

Montana | County

Population

11,961

Land Area

3,783.3 sq mi

Context

Nonmetro

Geography

County silhouette

Land Area
3,783.3 sq mi
Water Area
9.9 sq mi
Water Share
0.3%

Terrain Layer

Open the county terrain view inside the atlas flow.

Terra Firma

Population & Housing

Population

11,961

Density
3.2 / sq mi
Households
5,038
Housing Units
5,784
Median Age
42.7 years

Income & Economy

Median Household Income

$70,605

GDP

$695.62M

Real GDP Change+8.3%
Per Capita Income
$36,392
Personal Income
$705.22M
Personal Income Per Capita
$58,945

Classification

RUCC 7
Nonmetro

Urban population of 5,000 to 20,000, not adjacent to a metro area

Relief

Min

2,231 ft

Mean

2,831 ft

Max

3,781 ft

Provenance

GEOID 30017 ANSI 01720109
Latitude 46.26141 Longitude -105.55035
Canonical 2025 Gazetteer ACS ACS 2020-2024 5-year BEA BEA county 2024 release (2026-02-05) BLS BLS LAUS 2024 annual average USDA USDA RUCC 2023 USGS USGS 3DEP published as of 2026-03-23