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
Tonight
68°F
Chance Showers And Thunderstorms then Mostly Cloudy43% precip
Saturday
76°F
Showers And Thunderstorms Likely64% precip
Saturday Night
67°F
Showers And Thunderstorms Likely62% precip
Sunday
80°F
Partly Sunny then Slight Chance Rain Showers15% precip