26 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 61350 | Ottawa | 23,999 |
| 61364 | Streator | 18,236 |
| 61354 | Peru | 10,366 |
| 61301 | La Salle | 10,312 |
| 61342 | Mendota | 8,373 |
| 61341 | Marseilles | 7,249 |
| 60551 | Sheridan | 4,984 |
| 61348 | Oglesby | 4,397 |
| 60518 | Earlville | 3,576 |
| 61360 | Seneca | 3,320 |
| 60531 | Leland | 2,170 |
| 61373 | Utica | 2,120 |
| 61377 | Wenona | 1,458 |
| 61370 | Tonica | 1,250 |
| 61325 | Grand Ridge | 1,131 |
| 60549 | Serena | 836 |
| 60537 | Millington | 671 |
| 61334 | Lostant | 620 |
| 60470 | Ransom | 410 |
| 61358 | Rutland | 385 |
| 61372 | Troy Grove | 269 |
| 61321 | Dana | 232 |
| 61316 | Cedar Point | 212 |
| 61332 | Leonore | 150 |
| 60557 | Wedron | 129 |
| 61371 | Triumph | 75 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 26 ZCTAs in LaSalle County, Illinois (US Census).