Zip Code | City | Population |
|---|---|---|
| 61068 | Rochelle | 14,862 |
| 61010 | Byron | 7,399 |
| 61061 | Oregon | 6,880 |
| 61064 | Polo | 3,898 |
| 61054 | Mount Morris | 3,633 |
| 61020 | Davis Junction | 3,170 |
| 61084 | Stillman Valley | 3,118 |
| 61030 | Forreston | 2,292 |
| 61047 | Leaf River | 1,626 |
| 61052 | Monroe Center | 1,038 |
| 61015 | Chana | 903 |
| 61049 | Lindenwood | 644 |
| 61007 | Baileyville | 325 |
| 60113 | Creston | 245 |
| 60129 | Esmond | 224 |
| 61043 | Holcomb | 159 |
| 61091 | Woosung | 0 |