County Dossier
Mason County
Illinois | County
Population
12,745
Land Area
539.4 sq mi
Context
Nonmetro
Geography
County silhouette
- Land Area
- 539.4 sq mi
- Water Area
- 24.2 sq mi
- Water Share
- 4.3%
Terrain Layer
Open the county terrain view inside the atlas flow.
Population & Housing
Population
12,745
- Density
- 23.6 / sq mi
- Households
- 5,781
- Housing Units
- 6,622
- Median Age
- 45.4 years
Income & Economy
Median Household Income
$62,845
GDP
$633.78M
Real GDP Change+4.3%
- Per Capita Income
- $34,815
- Personal Income
- $722.26M
- Personal Income Per Capita
- $57,582
Classification
RUCC 8
Nonmetro
Urban population of fewer than 5,000, adjacent to a metro area
Relief
Min
429 ft
Mean
503 ft
Max
730 ft