St. Louis County MO United States
| County FIPS | 29510 |
| Largest City | St. Louis |
| State | Missouri |
| Latitude | 38.6358 |
| Longitude | -90.2451 |
| Population | 288,512 |
| Density | 4675.8 people per square mile |
| Time Zone | America/Chicago |
Median household: $56,160
Median individual: $38,541
Mode: 45.5% White
Median house value: $195,138.0
Median: 36.8 years old
With at least college degree: 41.2%
With STEM degree: 46.8%
Never married: 49.8%
Unemployed: 5.0%
All data comes from the SimpleMaps US Counties Database, 2026.
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