42 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 55811 | Duluth | 28,118 |
| 55803 | Duluth | 17,662 |
| 55746 | Hibbing | 16,730 |
| 55804 | Duluth | 15,922 |
| 55812 | Duluth | 10,859 |
| 55805 | Duluth | 10,602 |
| 55807 | Duluth | 9,763 |
| 55792 | Virginia | 9,663 |
| 55806 | Duluth | 9,356 |
| 55810 | Duluth | 8,285 |
| 55734 | Eveleth | 6,265 |
| 55808 | Duluth | 5,691 |
| 55719 | Chisholm | 5,613 |
| 55779 | Saginaw | 3,905 |
| 55705 | Aurora | 3,211 |
| 55768 | Mountain Iron | 2,964 |
| 55741 | Gilbert | 2,947 |
| 55802 | Duluth | 2,399 |
| 55750 | Hoyt Lakes | 2,068 |
| 55723 | Cook | 1,927 |
| 55790 | Tower | 1,847 |
| 55706 | Babbitt | 1,703 |
| 55771 | Orr | 1,484 |
| 55732 | Embarrass | 1,453 |
| 55751 | Iron | 1,388 |
| 55710 | Britt | 1,362 |
| 55736 | Floodwood | 1,344 |
| 55713 | Buhl | 1,048 |
| 55708 | Biwabik | 929 |
| 55703 | Angora | 906 |
| 55765 | Meadowlands | 803 |
| 55724 | Cotton | 707 |
| 55738 | Forbes | 599 |
| 55711 | Brookston | 540 |
| 55763 | Makinen | 495 |
| 55782 | Soudan | 420 |
| 55702 | Alborn | 412 |
| 55602 | Brimson | 346 |
| 55814 | Duluth | 319 |
| 55717 | Canyon | 287 |
| 55758 | Kinney | 121 |
| 55725 | Crane Lake | 89 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 42 ZCTAs in St. Louis County, Minnesota (US Census).