| Locality | Post Code |
|---|---|
| Fullerville, Saint Lawrence | 13642 |
| Gouverneur, Saint Lawrence | 13642 |
| Grantville, Saint Lawrence | 13667 |
| Hailesboro, Saint Lawrence | 13645 |
| Hammond, Saint Lawrence | 13646 |
| Hannawa Falls, Saint Lawrence | 13647 |
| Hatchs Corner, Saint Lawrence | 13684 |
| Helena, Saint Lawrence | 13649 |
| Hermon, Saint Lawrence | 13652 |
| Heuvelton, Saint Lawrence | 13654 |
| Hewittville, Saint Lawrence | 13668 |
| Hopkinton, Saint Lawrence | 12965 |
| Knapps Station, Saint Lawrence | 13668 |
| Langdon Corners, Saint Lawrence | 13617 |
| Lawrenceville, Saint Lawrence | 12949 |
| Lisbon, Saint Lawrence | 13658 |
| Lower Oswegatchie, Saint Lawrence | 13670 |
| Macomb, Saint Lawrence | 13642 |
| Madrid, Saint Lawrence | 13660 |
| Madrid Springs, Saint Lawrence | 13660 |
| Massena, Saint Lawrence | 13662 |
| Massena Springs, Saint Lawrence | 13662 |
| Morley, Saint Lawrence | 13617 |
| Morristown, Saint Lawrence | 13664 |
| Natural Dam, Saint Lawrence | 13642 |
| Newton Falls, Saint Lawrence | 13666 |