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Where am ILOCATED

St. Charles County, Missouri

St. Charles County, Missouri, has 426,499 residents (July 2025 estimate). Its county seat is St. Charles. It uses Central Time and covers 560 sq mi (1,451 km²) of land.

Kansas CitySt. LouisSpringfield
St. Charles County in Missouri
St. Louis CountyO'FallonSt. CharlesWentzvilleLake St. Louis
St. Charles County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
426,499
Land area
560 sq mi (1,451 km²)
County seat or government
St. Charles
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$104,692 ± $1,179
Median home value
$320,800 ± $3,551
Median rent, with utilities
$1,370 ± $21
Homes lived in by their owners
80.5% ± 0.6 points
County type
County
Metro or micro area
St. Louis, MO-IL metro areaCentral county
Water area
32.1 sq mi (83 km²)
State
Missouri
County code (FIPS)
29183
Coordinates (central point)
38.781102, -90.674915
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. Charles 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. 6337674,962 people
  2. 6336654,769 people
  3. 6330152,667 people
  4. 6338551,330 people
  5. 6336846,966 people
  6. 6330346,089 people
  7. 6330443,195 people
  8. 6336729,725 people
  9. 6334810,394 people
  10. 633576,536 people
  11. 633413,515 people
  12. 633321,651 people
All 15
  1. 63373690 people
  2. 63386482 people
  3. 6336551 people

15 ZIP Code areas overlap St. Charles 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

St. Charles County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in St. Charles County, largest first

  1. Boone Township63,853 people
  2. Wentzville Township57,686 people
  3. Lake St. Louis Township30,539 people
  4. O'Fallon Township30,473 people
  5. Dardenne Township26,384 people
  6. Rivers Township26,342 people
  7. Cottleville Township25,182 people
  8. Frontier Township25,144 people
  9. Weldon Spring Township24,884 people
  10. Lindenwood Township22,122 people
  11. Spencer Creek Township21,513 people
  12. Harvester Township21,238 people
All 14
  1. Zumbehl Township20,071 people
  2. St. Peters Township19,104 people

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

School districts in St. Charles County, largest first

  1. Francis Howell R-III School District120,664 people
  2. Fort Zumwalt R-II School District116,620 people
  3. Wentzville R-IV School District106,353 people
  4. St. Charles R-VI School District53,814 people
  5. Washington School District34,631 people
  6. Orchard Farm R-V School District15,287 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. O'Fallon, Missouri (city)93,801 people
  2. St. Charles, Missouri (city)71,508 people
  3. St. Peters, Missouri (city)59,092 people
  4. Wentzville, Missouri (city)47,061 people
  5. Lake St. Louis, Missouri (city)18,066 people
  6. Dardenne Prairie, Missouri (city)13,503 people
  7. Cottleville, Missouri (city)5,937 people
  8. Weldon Spring, Missouri (city)5,310 people
  9. St. Paul, Missouri (city)3,456 people
  10. Foristell, Missouri (city)1,096 people
  11. Josephville, Missouri (village)664 people
  12. Flint Hill, Missouri (city)583 people
All 18
  1. West Alton, Missouri (city)467 people
  2. New Melle, Missouri (city)452 people
  3. Portage Des Sioux, Missouri (city)340 people
  4. Augusta, Missouri (town)285 people
  5. Weldon Spring Heights, Missouri (town)121 people
  6. Defiance, Missouri (CDP)63 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. St. Louis County, Missouri16 mi southeast
  2. Lincoln County, Missouri25 mi northwest
  3. Warren County, Missouri26 mi west
  4. Calhoun County, Illinois26 mi north
  5. Jersey County, Illinois27 mi northeast
  6. Franklin County, Missouri33 mi southwest
  7. Madison County, Illinois42 mi east

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.