Cities, Towns, Neighborhoods & Other Populated Places in St. Lawrence County.
| City Name | Title | County | Population |
|---|---|---|---|
| Ogdensburg | City in New York, USA | 10,436 | |
| Massena | City in Cass County, Iowa, United States of America | 10,200 | |
| Potsdam | Village in New York | 8,991 | |
| Canton | Village in St. | 6,496 | |
| Norfolk | Town in New York USA | 4,475 | |
| Oswegatchie | Human settlement in St. | 4,263 | |
| Lisbon | Town in New York, USA | 4,054 | |
| Gouverneur | Town in New York, USA | 3,666 | |
| Louisville | Human settlement in St. | 3,021 | |
| Pierrepont | Human settlement in St. | 2,484 | |
| De Kalb | Town in St. | 2,314 | |
| Fowler | Town in New York, United States | 2,119 | |
| Parishville | Human settlement in St. | 2,038 | |
| Russell | Town in New York, USA | 1,789 | |
| Madrid | City in New York, United States | 1,639 | |
| Norwood | Village in St. | 1,560 | |
| Fine | Town in United States of America | 1,444 | |
| Colton | Town in St. | 1,410 | |
| Edwards | Hamlet in St. | 1,096 | |
| De Peyster | Human settlement in St. | 1,053 | |
| Hermon | Human settlement in St. | 1,043 | |
| Hannawa Falls | 1,042 | ||
| Hopkinton | Human settlement in St. | 1,026 | |
| Waddington | Human settlement in New York, United States of America | 943 | |
| Rossie | Human settlement in St. | 836 | |
| Star Lake | 809 | ||
| Pitcairn | Town in St. | 799 | |
| Heuvelton | Village in St. | 722 | |
| Stark | Town in New York, USA | 711 | |
| Brasher Falls | 669 | ||
| Hailesboro | 624 | ||
| De Kalb Junction | 519 | ||
| Winthrop | 510 | ||
| Morristown | Town in St. | 377 | |
| Rensselaer Falls | Human settlement in St. | 307 | |
| Richville | Human settlement in St. | 302 | |
| Piercefield | Human settlement in St. | 285 | |
| Hammond | Town in St. | 270 | |
| Clare | Human settlement in St. | 101 |