St. Louis County, MO Map
Official Census boundary of St. Louis County, Missouri (FIPS 29189). Turn on flood zones, contours, land cover and school districts, measure distances, or click any spot to inspect it.
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St. Louis County Demographics
Source: U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates.
Population
995,569
Households
413,849
Median household income
$82,936
Median age
40.3 years
Median home value
$276,800
Median gross rent
$1,209/mo
Owner-occupied homes
69.2%
Bachelor's degree or higher
47.4%
Below poverty level
9.8%
Land area
508 sq mi
Population density
1,960 / sq mi