42 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 55811 | Duluth | 27,907 |
| 55803 | Duluth | 17,795 |
| 55746 | Hibbing | 16,815 |
| 55804 | Duluth | 16,018 |
| 55812 | Duluth | 11,016 |
| 55805 | Duluth | 10,277 |
| 55792 | Virginia | 9,848 |
| 55807 | Duluth | 9,573 |
| 55806 | Duluth | 9,545 |
| 55810 | Duluth | 8,305 |
| 55734 | Eveleth | 6,332 |
| 55719 | Chisholm | 5,642 |
| 55808 | Duluth | 5,325 |
| 55779 | Saginaw | 3,981 |
| 55705 | Aurora | 3,248 |
| 55741 | Gilbert | 2,933 |
| 55768 | Mountain Iron | 2,791 |
| 55802 | Duluth | 2,560 |
| 55750 | Hoyt Lakes | 2,078 |
| 55790 | Tower | 1,933 |
| 55723 | Cook | 1,861 |
| 55706 | Babbitt | 1,827 |
| 55771 | Orr | 1,616 |
| 55732 | Embarrass | 1,398 |
| 55710 | Britt | 1,391 |
| 55751 | Iron | 1,364 |
| 55736 | Floodwood | 1,326 |
| 55713 | Buhl | 1,048 |
| 55703 | Angora | 929 |
| 55708 | Biwabik | 850 |
| 55765 | Meadowlands | 755 |
| 55724 | Cotton | 719 |
| 55738 | Forbes | 584 |
| 55711 | Brookston | 518 |
| 55763 | Makinen | 467 |
| 55782 | Soudan | 439 |
| 55702 | Alborn | 422 |
| 55814 | Duluth | 311 |
| 55602 | Brimson | 310 |
| 55717 | Canyon | 241 |
| 55758 | Kinney | 161 |
| 55725 | Crane Lake | 93 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 42 ZCTAs in St. Louis County, Minnesota (US Census).