100 Smallest ZIP Codes in the United States by Population in Warren 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 Warren County, Illinois.
| Rank | ZIP Code | City | State | Population |
|---|---|---|---|---|
| 1 | 61435 | GERLAW | IL | 155 |
| 2 | 61417 | BERWICK | IL | 237 |
| 3 | 61478 | SMITHSHIRE | IL | 383 |
| 4 | 61423 | CAMERON | IL | 497 |
| 5 | 61453 | LITTLE YORK | IL | 691 |
| 6 | 61447 | KIRKWOOD | IL | 1,133 |
| 7 | 61412 | ALEXIS | IL | 1,154 |
| 8 | 61473 | ROSEVILLE | IL | 1,307 |
| 9 | 61462 | MONMOUTH | IL | 10,855 |