St. Louis County, Missouri
St. Louis County is a county in Missouri. Its county FIPS code is 29189. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 29189
- Representative coordinates
- 38.640438, -90.445497
- County type
- County
- County seat or government
- Clayton
- Resident population, July 2025
- 990,911
- Land area
- 1,317.075 km²
- Water area
- 40.009 km²
- State
- Missouri
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in St. Louis County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
63005 · 63011 · 63017 · 63021 · 63025 · 63026 · 63031 · 63033 · 63034 · 63038 · 63040 · 63042 · 63043 · 63044 · 63045 · 63049 · 63069 · 63073 · 63074 · 63088 · 63105 · 63114 · 63117 · 63119 · 63120 · 63121 · 63122 · 63123 · 63124 · 63125 · 63126 · 63127 · 63128 · 63129 · 63130 · 63131 · 63132 · 63133 · 63134 · 63135 · 63136 · 63137 · 63138 · 63140 · 63141 · 63143 · 63144 · 63146 · 63304
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Use the US government local-office directory ↗ to find the office responsible for your address. A county website has not been confidently matched here. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Affton CDP, MO
- Ballwin city, MO
- Bella Villa city, MO
- Bellefontaine Neighbors city, MO
- Bellerive Acres city, MO
- Bel-Nor village, MO
- Bel-Ridge village, MO
- Berkeley city, MO
- Beverly Hills city, MO
- Black Jack city, MO
- Breckenridge Hills city, MO
- Brentwood city, MO
- Bridgeton city, MO
- Calverton Park city, MO
- Castle Point CDP, MO
- Champ village, MO
- Charlack city, MO
- Chesterfield city, MO
- Clarkson Valley city, MO
- Clayton city, MO
- Concord CDP, MO
- Cool Valley city, MO
- Country Club Hills city, MO
- Country Life Acres village, MO
- Crestwood city, MO
- Creve Coeur city, MO
- Crystal Lake Park city, MO
- Dellwood city, MO
- Des Peres city, MO
- Edmundson city, MO
Browse all cities, towns and communities for St. Louis County
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county at your current point, check its ZIP area, or find its physical time zone.
Small boundary contacts to check
These maps have small contacts that do not confidently establish another jurisdiction or clock zone. They remain separate from the main answer. Check a precise address near the line with the responsible authority.