County Dossier

St. Johns County

Florida | County

Population

306,934

Land Area

600.7 sq mi

Context

Metro

Geography

County silhouette

Land Area
600.7 sq mi
Water Area
220.9 sq mi
Water Share
26.9%

Terrain Layer

Open the county terrain view inside the atlas flow.

Terra Firma

Population & Housing

Population

306,934

Density
511.0 / sq mi
Households
115,794
Housing Units
133,504
Median Age
44.2 years

Income & Economy

Median Household Income

$109,839

GDP

$18.62B

Real GDP Change+3.8%
Per Capita Income
$57,346
Personal Income
$31.17B
Personal Income Per Capita
$93,079

Classification

RUCC 1
Metro

Counties in metro areas of 1 million population or more

Relief

Min

-4 ft

Mean

16 ft

Max

102 ft

Provenance

GEOID 12109 ANSI 00308371
Latitude 29.88140 Longitude -81.38828
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