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Where am ILOCATED

St. Louis County, Missouri

St. Louis County, Missouri, has 990,911 residents (July 2025 estimate). Its county seat is Clayton. It uses Central Time and covers 509 sq mi (1,317 km²) of land.

Kansas CitySt. LouisSpringfield
St. Louis County in Missouri
Madison CountySt. Clair CountySt. Charles CountySt. Louis cityFlorissantChesterfieldOakvilleWildwoodUniversity City
St. Louis County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
990,911
Land area
509 sq mi (1,317 km²)
County seat or government
Clayton
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$82,936 ± $1,390
Median home value
$276,800 ± $2,745
Median rent, with utilities
$1,209 ± $12
Homes lived in by their owners
69.2% ± 0.5 points
County type
County
Metro or micro area
St. Louis, MO-IL metro areaCentral county
Water area
15.4 sq mi (40 km²)
State
Missouri
County code (FIPS)
29189
Coordinates (central point)
38.640438, -90.445497
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in St. Louis County

Time zoneLocal time and UTC offsetNext clock change
Central TimeAmerica/ChicagoUTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 6302155,666 people
  2. 6312951,553 people
  3. 6303150,196 people
  4. 6312349,077 people
  5. 6302645,354 people
  6. 6301743,243 people
  7. 6330443,195 people
  8. 6303343,056 people
  9. 6312241,634 people
  10. 6313640,929 people
  11. 6301135,920 people
  12. 6311934,181 people
All 49
  1. 6311433,969 people
  2. 6312533,294 people
  3. 6314630,678 people
  4. 6312830,540 people
  5. 6313028,910 people
  6. 6312125,008 people
  7. 6304321,924 people
  8. 6314120,932 people
  9. 6300519,779 people
  10. 6313719,684 people
  11. 6302519,508 people
  12. 6303418,908 people
  13. 6310518,875 people
  14. 6313518,381 people
  15. 6313818,233 people
  16. 6313117,935 people
  17. 6304217,813 people
  18. 6304916,592 people
  19. 6307415,793 people
  20. 6306915,697 people
  21. 6312615,452 people
  22. 6313214,283 people
  23. 6313413,059 people
  24. 6312410,839 people
  25. 6304410,324 people
  26. 631449,505 people
  27. 631179,261 people
  28. 631438,975 people
  29. 630408,526 people
  30. 630888,226 people
  31. 630387,107 people
  32. 631206,790 people
  33. 631336,569 people
  34. 631275,268 people
  35. 63073803 people
  36. 63140316 people
  37. 630450 people

49 ZIP Code areas overlap St. Louis County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in St. Louis County, largest first

  1. Chesterfield Township43,607 people
  2. Meramec Township41,348 people
  3. Lewis and Clark Township38,705 people
  4. Tesson Ferry Township38,647 people
  5. Clayton Township38,597 people
  6. Queeny Township38,342 people
  7. Bonhomme Township37,971 people
  8. Creve Coeur Township37,727 people
  9. Maryland Heights Township37,485 people
  10. Concord Township37,302 people
  11. Jefferson Township37,258 people
  12. Oakville Township36,966 people
All 28
  1. Missouri River Township36,328 people
  2. Lemay Township35,996 people
  3. Spanish Lake Township35,714 people
  4. Hadley Township34,988 people
  5. Airport Township34,926 people
  6. Wildhorse Township34,686 people
  7. Gravois Township34,422 people
  8. Midland Township33,996 people
  9. Florissant Township33,887 people
  10. Ferguson Township33,263 people
  11. Lafayette Township33,077 people
  12. Northwest Township32,935 people
  13. University Township30,442 people
  14. Normandy Township30,173 people
  15. St. Ferdinand Township29,631 people
  16. Norwood Township27,150 people

People counts are American Community Survey 2020–2024 5-year estimates. All townships in Missouri, by county

School districts in St. Louis County, largest first

  1. Parkway C-2 School District142,507 people
  2. Rockwood R-VI School District122,218 people
  3. Hazelwood School District120,450 people
  4. Mehlville R-IX School District94,976 people
  5. Ferguson-Florissant R-II School District64,285 people
  6. Lindbergh School District50,233 people
  7. Kirkwood R-VII School District43,373 people
  8. Ritenour School District42,730 people
  9. Pattonville R-III School District40,702 people
  10. University City School District35,253 people
  11. Riverview Gardens School District34,032 people
  12. Normandy Schools Collaborative33,245 people
All 23
  1. Webster Groves School District33,219 people
  2. Ladue School District27,794 people
  3. Affton 101 School District25,816 people
  4. Meramec Valley R-III School District23,491 people
  5. Clayton School District19,163 people
  6. Jennings School District15,484 people
  7. Maplewood-Richmond Heights School District14,412 people
  8. Bayless School District12,728 people
  9. Brentwood School District8,820 people
  10. Valley Park School District8,674 people
  11. Hancock Place School District8,533 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Florissant, Missouri (city)51,773 people
  2. Chesterfield, Missouri (city)49,574 people
  3. Oakville, Missouri (CDP)35,333 people
  4. Wildwood, Missouri (city)35,133 people
  5. University City, Missouri (city)34,685 people
  6. Ballwin, Missouri (city)31,279 people
  7. Mehlville, Missouri (CDP)29,805 people
  8. Kirkwood, Missouri (city)29,363 people
  9. Maryland Heights, Missouri (city)27,880 people
  10. Hazelwood, Missouri (city)25,114 people
  11. Webster Groves, Missouri (city)23,712 people
  12. Old Jamestown, Missouri (CDP)20,651 people
All 98
  1. Affton, Missouri (CDP)19,052 people
  2. Creve Coeur, Missouri (city)18,643 people
  3. Concord, Missouri (CDP)18,368 people
  4. Ferguson, Missouri (city)18,213 people
  5. Manchester, Missouri (city)18,160 people
  6. Spanish Lake, Missouri (CDP)17,873 people
  7. Clayton, Missouri (city)17,380 people
  8. Lemay, Missouri (CDP)16,228 people
  9. Overland, Missouri (city)15,695 people
  10. Eureka, Missouri (city)13,081 people
  11. Jennings, Missouri (city)12,918 people
  12. St. Ann, Missouri (city)12,811 people
  13. Crestwood, Missouri (city)12,295 people
  14. Town and Country, Missouri (city)11,607 people
  15. Bridgeton, Missouri (city)11,369 people
  16. Bellefontaine Neighbors, Missouri (city)10,498 people
  17. Ellisville, Missouri (city)10,002 people
  18. Des Peres, Missouri (city)9,170 people

See all 98 cities, towns and communities in St. Louis County, largest first

Bordering areas, nearest first

Distances are straight lines between map points.

  1. St. Louis city, Missouri11 mi east
  2. St. Charles County, Missouri16 mi northwest
  3. Jefferson County, Missouri27 mi south
  4. Monroe County, Illinois29 mi southeast
  5. St. Clair County, Illinois30 mi southeast
  6. Madison County, Illinois32 mi northeast
  7. Franklin County, Missouri37 mi southwest

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 where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.