St. Clair County
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- Population
- 253,694
- Area
- 657.74 sq mi (1,703.53 km²), 16.15 sq mi water
- Median age
- 39.9
- Households
- 100,846
- Persons per household
- 2.5
- Median household income
- $73,854
- Median house value
- $180,300
Demographics: 2020–2024 ACS
Tonight
68°F
Mostly Cloudy then Patchy Fog9% precip
Friday
83°F
Chance Rain Showers30% precip
Friday Night
68°F
Slight Chance Rain Showers then Partly Cloudy15% precip
Saturday
89°F
Mostly Sunny7% precip
Cities & Towns in St. Clair County
BellevilleBrooklynCahokia HeightsCanteen TownshipCaseyvilleCaseyville TownshipCentreville TownshipCollinsvilleColumbiaDarmstadtDupoEast CarondeletEast St. LouisEast St. Louis TownshipEngelmann TownshipFairmont CityFairview HeightsFayettevilleFayetteville TownshipFloravilleFreeburgFreeburg TownshipLebanonLebanon TownshipLenzburgLenzburg TownshipMadisonMarissaMarissa TownshipMascoutahMascoutah TownshipMillstadtMillstadt TownshipNew AthensNew Athens TownshipNew BadenO'FallonO'Fallon TownshipPaderbornPrairie Du Long TownshipRentchlerSaugetScott AFBShilohShiloh Valley TownshipSmithtonSmithton TownshipSt. Clair TownshipSt. LiboryStites TownshipStookey TownshipSugar Loaf TownshipSummerfieldSwanseaWashington Park