100 Largest ZIP Codes in the United States by Population in St. Clair County, Illinois
Explore the 100 largest ZIP codes in the United States ranked by population using U.S. Census demographic data. This page lists ZIP codes located in St. Clair County, Illinois.
| Rank | ZIP Code | City | State | Population |
|---|---|---|---|---|
| 1 | 62269 | O FALLON | IL | 35,467 |
| 2 | 62221 | BELLEVILLE | IL | 29,454 |
| 3 | 62226 | BELLEVILLE | IL | 29,333 |
| 4 | 62220 | BELLEVILLE | IL | 19,277 |
| 5 | 62208 | FAIRVIEW HEIGHTS | IL | 16,690 |
| 6 | 62223 | BELLEVILLE | IL | 16,534 |
| 7 | 62206 | EAST SAINT LOUIS | IL | 13,477 |
| 8 | 62258 | MASCOUTAH | IL | 10,572 |
| 9 | 62232 | CASEYVILLE | IL | 6,920 |
| 10 | 62207 | EAST SAINT LOUIS | IL | 6,637 |
| 11 | 62254 | LEBANON | IL | 6,586 |
| 12 | 62260 | MILLSTADT | IL | 6,461 |
| 13 | 62243 | FREEBURG | IL | 6,271 |
| 14 | 62203 | EAST SAINT LOUIS | IL | 6,076 |
| 15 | 62204 | EAST SAINT LOUIS | IL | 5,908 |
| 16 | 62205 | EAST SAINT LOUIS | IL | 5,754 |
| 17 | 62225 | SCOTT AIR FORCE BASE | IL | 5,359 |
| 18 | 62201 | EAST SAINT LOUIS | IL | 5,166 |
| 19 | 62285 | SMITHTON | IL | 4,512 |
| 20 | 62239 | DUPO | IL | 4,076 |
| 21 | 62264 | NEW ATHENS | IL | 3,237 |
| 22 | 62240 | EAST CARONDELET | IL | 2,197 |
| 23 | 62257 | MARISSA | IL | 1,897 |
| 24 | 62255 | LENZBURG | IL | 1,030 |
| 25 | 62282 | SAINT LIBORY | IL | 646 |
| 26 | 62059 | LOVEJOY | IL | 629 |
| 27 | 62289 | SUMMERFIELD | IL | 397 |