St. Clair County, Illinois
27 ZIP codes · 657.75 sq mi of land · FIPS 17163
| Population | 253,694 |
|---|---|
| State | Illinois |
| FIPS code | 17163 |
| Time zone | Central |
| Land area | 657.75 sq mi |
| Center (lat, long) | 38.4702, -89.9285 |
Area codes in this area
These are the area codes that most often serve St. Clair County (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
Cities and towns (largest first)
Belleville · 41,370Fairview Heights · 16,745LovejoyEast Saint LouisScott Air Force BaseCaseyvilleDupoEast CarondeletFreeburgLebanonLenzburgMarissaMascoutahMillstadtNew AthensO FallonSaint LiborySmithtonSummerfield
ZIP codes in St. Clair County
62059 Lovejoy62201 East Saint Louis62203 East Saint Louis62204 East Saint Louis62205 East Saint Louis62206 East Saint Louis62207 East Saint Louis62208 Fairview Heights62220 Belleville62221 Belleville62223 Belleville62225 Scott Air Force Base62226 Belleville62232 Caseyville62239 Dupo62240 East Carondelet62243 Freeburg62254 Lebanon62255 Lenzburg62257 Marissa62258 Mascoutah62260 Millstadt62264 New Athens62269 O Fallon62282 Saint Libory62285 Smithton62289 Summerfield
Population: U.S. Census Bureau, ACS 5-year estimates, 2024.