45 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 13662 | Massena | 15,737 |
| 13669 | Ogdensburg | 15,615 |
| 13676 | Potsdam | 13,408 |
| 13617 | Canton | 12,294 |
| 13642 | Gouverneur | 9,018 |
| 13667 | Norfolk | 3,460 |
| 13668 | Norwood | 3,313 |
| 13613 | Brasher Falls | 2,733 |
| 13646 | Hammond | 2,373 |
| 13654 | Heuvelton | 2,370 |
| 13699 | Potsdam | 2,123 |
| 13658 | Lisbon | 2,028 |
| 13660 | Madrid | 1,953 |
| 13697 | Winthrop | 1,951 |
| 13652 | Hermon | 1,876 |
| 13625 | Colton | 1,689 |
| 13680 | Rensselaer Falls | 1,417 |
| 12967 | North Lawrence | 1,363 |
| 13630 | De Kalb Junction | 1,307 |
| 13635 | Edwards | 1,283 |
| 13694 | Waddington | 1,232 |
| 13684 | Russell | 1,105 |
| 13681 | Richville | 941 |
| 13621 | Chase Mills | 683 |
| 13690 | Star Lake | 651 |
| 13687 | South Colton | 421 |
| 13672 | Parishville | 408 |
| 13664 | Morristown | 401 |
| 13670 | Oswegatchie | 382 |
| 13633 | De Peyster | 378 |
| 12927 | Cranberry Lake | 308 |
| 13614 | Brier Hill | 287 |
| 12965 | Nicholville | 281 |
| 13666 | Newton Falls | 236 |
| 13696 | West Stockholm | 188 |
| 13695 | Wanakena | 169 |
| 13647 | Hannawa Falls | 159 |
| 12973 | Piercefield | 136 |
| 13623 | Chippewa Bay | 76 |
| 13683 | Rooseveltown | 58 |
| 13649 | Helena | 58 |
| 12922 | Childwold | 33 |
| 13639 | Fine | 23 |
| 13678 | Raymondville | 19 |
| 13645 | Hailesboro | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 45 ZCTAs in St. Lawrence County, New York (US Census).