St. Charles County
- Population
- 414,535
- Area
- 0.56 sq mi (1.45 km²), 0.03 sq mi water
- Median age
- 39.8
- Households
- 161,311
- Persons per household
- 2.5
- Median household income
- $104,692
- Median house value
- $320,800
Demographics: 2020–2024 ACS
This Afternoon
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Sunny
Tonight
69°F
Mostly Clear6% precip
Saturday
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Sunny
Saturday Night
64°F
Mostly Clear