| Locality | Post Code |
|---|---|
| North Ottawa, LaSalle | 61350 |
| North Utica, LaSalle | 61373 |
| Norway, LaSalle | 60551 |
| Oglesby, LaSalle | 61348 |
| Ottawa, LaSalle | 61350 |
| Peru, LaSalle | 61354 |
| Piety Hill, LaSalle | 61348 |
| Prairie, LaSalle | 61350 |
| Ransom, LaSalle | 60470 |
| Rockwell, LaSalle | 61301 |
| Rollo, LaSalle | 60518 |
| Rutland, LaSalle | 61358 |
| Seneca, LaSalle | 61360 |
| Serena, LaSalle | 60549 |
| Sheridan, LaSalle | 60551 |
| South Streator, LaSalle | 61364 |
| Stavanger, LaSalle | 61360 |
| Stoneyville, LaSalle | 61350 |
| Streator, LaSalle | 61364 |
| Streator East, LaSalle | 61364 |
| Streator West, LaSalle | 61364 |
| Tomahawk Bluff, LaSalle | 61301 |
| Tonica, LaSalle | 61370 |
| Triumph, LaSalle | 61371 |
| Troy Grove, LaSalle | 61372 |
| Utica, LaSalle | 61373 |