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St. Charles County
Sign in to saveAlso known as St. Charles County, Missouri, Saint Charles County, Missouri, St. Charles County, MO
county in Missouri, United States
Key facts
- Country
- United States
- State
- Missouri
- Founded
- October 1, 1812
- Named after
- Charles Borromeo
- Seat
- St. Charles
- Largest city
- O'Fallon
- County executive
- Steve Ehlmann ( R )
- Total
- 593 sq mi (1,540 km )
- Land
- 560 sq mi (1,500 km )
- Water
- 32 sq mi (83 km ) 5.4%
- Estimate 2025
- 426,499
- Density
- 720/sq mi (280/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
- Congressional districts
- 2nd , 3rd
- Website
- www .sccmo .org
via Wikipedia infobox
Wikidata facts
- Population
- 405262
- Area
- 1534
- Official website
- www.sccmo.org
- Image
- St. Charles County Missouri Courthouse 20141018 A.jpg
- Households
- 149472
Show 5 more facts
- Commons category
- St. Charles County, Missouri
- water as percent of area
- 5.4
- inception
- 1812-10-01
- native label
- St. Charles County
- per capita income
- 40738
Sources (10)
via Wikidata · CC0
~19 min read
Article
St. Charles County is located in the central eastern part of the U.S. state of Missouri. As of the 2020 census, the population was 405,262, making it Missouri's third-most populous county. Its county seat is St. Charles. The county was organized October 1, 1812, and named for Saint Charles Borromeo, an Italian cardinal.
St. Charles County is part of the St. Louis, MO-IL Metropolitan Statistical Area and contains many of the city's northwestern suburbs. The wealthiest county in Missouri, St. Charles County is one of the nation's fastest-growing counties.