| Zip Code | City | Population ↓ |
|---|---|---|
| 55720 | Cloquet | 17,448 |
| 55733 | Esko | 5,139 |
| 55767 | Moose Lake | 4,582 |
| 55707 | Barnum | 3,470 |
| 55718 | Carlton | 3,111 |
| 55797 | Wrenshall | 1,457 |
| 55726 | Cromwell | 1,087 |
| 55757 | Kettle River | 739 |
| 55798 | Wright | 627 |
| 55749 | Holyoke | 532 |
| 55780 | Sawyer | 277 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 11 ZCTAs in Carlton County, Minnesota (US Census).