| ZIP Code | ZIP Code Place Name | County | ZIP Code Type |
|---|---|---|---|
| 61014 | Chadwick | Carroll County | Standard |
| 61021 | Dixon | Lee County | Standard |
| 61037 | Galt | Whiteside County | PO Box |
| 61064 | Polo | Ogle County | Standard |
| 61071 | Rock Falls | Whiteside County | Standard |
| 61081 | Sterling | Whiteside County | Standard |
| 61230 | Albany | Whiteside County | Standard |
| 61243 | Deer Grove | Whiteside County | Standard |
| 61250 | Erie | Whiteside County | Standard |
| 61251 | Fenton | Whiteside County | Standard |
| 61252 | Fulton | Whiteside County | Standard |
| 61261 | Lyndon | Whiteside County | Standard |
| 61270 | Morrison | Whiteside County | Standard |
| 61277 | Prophetstown | Whiteside County | Standard |
| 61283 | Tampico | Whiteside County | Standard |