St. Charles County
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- Population
- 414,535
- Area
- 560.5 sq mi (1,451.69 km²), 31.92 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
Tonight
67°F
Cloudy then Patchy Fog8% precip
Friday
82°F
Patchy Fog then Slight Chance Rain Showers19% precip
Friday Night
68°F
Mostly Clear10% precip
Saturday
89°F
Mostly Sunny9% precip