St. Clair County, Illinois ZIP Codes
- ZIP records
27 - Cities represented
19 - Sum of listed ZIP population estimates
247,743
Population sum includes positive estimates in these ZIP records; it is not an official county population.
Top ZIP Codes by Population
| Rank | ZIP Code | City | Population estimate |
|---|---|---|---|
| 1 | 62269 | O'Fallon | 35,923 |
| 2 | 62221 | Belleville | 29,875 |
| 3 | 62226 | Belleville | 28,255 |
| 4 | 62220 | Belleville | 19,152 |
| 5 | 62208 | Fairview Heights | 16,821 |
| 6 | 62223 | Belleville | 16,269 |
| 7 | 62206 | East Saint Louis | 12,959 |
| 8 | 62258 | Mascoutah | 10,437 |
| 9 | 62232 | Caseyville | 7,063 |
| 10 | 62207 | East Saint Louis | 6,984 |
Cities in St. Clair County
- Belleville
- Caseyville
- Dupo
- East Carondelet
- East Saint Louis
- Fairview Heights
- Freeburg
- Lebanon
- Lenzburg
- Lovejoy
- Marissa
- Mascoutah
- Millstadt
- New Athens
- O'Fallon
- Saint Libory
- Scott Air Force Base
- Smithton
- Summerfield
ZIP Directory
- ZIP 62059
- ZIP 62201
- ZIP 62203
- ZIP 62204
- ZIP 62205
- ZIP 62206
- ZIP 62207
- ZIP 62208
- ZIP 62220
- ZIP 62221
- ZIP 62223
- ZIP 62225
- ZIP 62226
- ZIP 62232
- ZIP 62239
- ZIP 62240
- ZIP 62243
- ZIP 62254
- ZIP 62255
- ZIP 62257
- ZIP 62258
- ZIP 62260
- ZIP 62264
- ZIP 62269
- ZIP 62282
- ZIP 62285
- ZIP 62289
Browse all ZIP data for Illinois
Methodology: Records are grouped by the source file's listed county and state. Population sums add positive ZIP-level estimates and are not official county totals; city counts use distinct city labels in the source.