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