County Dossier

Ada County

Idaho | County

Population

518,935

Land Area

1,052.3 sq mi

Context

Metro

Geography

County silhouette

Land Area
1,052.3 sq mi
Water Area
8.5 sq mi
Water Share
0.8%

Terrain Layer

Open the county terrain view inside the atlas flow.

Terra Firma

Population & Housing

Population

518,935

Density
493.2 / sq mi
Households
202,543
Housing Units
211,440
Median Age
38.4 years

Income & Economy

Median Household Income

$91,502

GDP

$45.45B

Real GDP Change+4.8%
Per Capita Income
$49,757
Personal Income
$41.21B
Personal Income Per Capita
$76,921

Classification

RUCC 2
Metro

Counties in metro areas of 250,000 to 1 million population

Relief

Min

2,258 ft

Mean

3,050 ft

Max

5,990 ft

Provenance

GEOID 16001 ANSI 00395066
Latitude 43.45148 Longitude -116.24438
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