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List of towns, formation dates, and other details
| Brasher | |
| 1817 Settled | |
| 1825 Formed from Town of Massena | |
| 1828 Daughter town Lawrence formed | |
| Canton | |
| 1800 Settled | |
| 1805 Formed from Town of Lisbon | |
| Clare | |
| 1880 Formed from Town of Pierrepont | |
| Clifton | |
| 1868 Formed from Town of Pierrepont | |
| Colton | |
| 1824 Settled at Colton Village | |
| 1843 Formed from Town of Parishville | |
| 1851 Annexed land from Town of Parishville | |
| De Kalb | |
| 1803 Settlers from Otsego County | |
| 1806 Formed from Town of Oswegatchie | |
| 1825 Daughter town De Peyster formed | |
| 1830 Daughter town Depau (now Hermon) formed | |
| Depau | |
| Name for Town of Hermon 1830–1834 | |
| De Peyster | |
| 1802 Settlers from Vermont | |
| 1825 Formed from towns of De Kalb and Oswegatchie | |
| Edwards | |
| 1812 Settled along St. Lawrence Turnpike | |
| 1827 Formed from Town of Fowler | |
| 1830 Daughter town Depau (now Hermon) formed | |
| 1850 Annexed land from Town of Hermon | |
| Fine | |
| c. 1825 Settled | |
| 1844 Formed from towns of Pierrepont and Russell | |
| Fowler | |
| 1807 Settled at Hailesboro(ugh) | |
| 1816 Formed from towns of Rossie and Russell | |
| 1827 Daughter town Edwards formed | |
| 1836 Daughter town Pitcairn formed | |
| Gouverneur | |
| 1805 Settled | |
| 1810 Formed from Town of Oswegatchie | |
| 1841 Daughter town Macomb formed | |
| Hammond | |
| Sparsely settled from 1812; settled by Scots west of Hammond village 1818–1821 | |
| 1827 Formed from towns of Morristown and Rossie | |
| 1842 Ceded land to Town of Macomb | |
| 1844 Ceded land to Town of Rossie | |
| Hermon | |
| c. 1812 Settled | |
| 1830 Formed as Depau from towns of De Kalb and Edwards | |
| 1834 Name changed to Hermon | |
| 1850 Ceded land to Town of Edwards | |
| Hopkinton | |
| 1802 Settled | |
| 1805 Formed from Town of Massena | |
| 1807 Daughter town Russell formed | |
| 1818 Daughter town Parishville formed | |
| 1828 Daughter town Lawrence formed | |
| 1900 Daughter town Piercefield formed | |
| Lawrence | |
| 1806 Settled | |
| 1828 Formed from towns of Brasher and Hopkinton | |
| Lisbon | |
| 1799 Settled | |
| 1801 Formed as a town in Clinton County | |
| 1802 Transferred to new county of St. Lawrence; daughter towns Madrid and Oswegatchie formed | |
| 1805 Daughter town Canton formed | |
| Louisville | |
| 1800 Settled | |
| 1810 Formed from Town of Massena | |
| 1823 Daughter town Norfolk formed | |
| 1844 Annexed land from Town of Norfolk | |
| Macomb | |
| 1805–06 Settled on Old State Road | |
| 1841 Formed from towns of Gouverneur and Morristown | |
| 1842 Annexed land from Town of Hammond | |
| Madrid | |
| 1798 Settled | |
| 1802 Formed from Town of Lisbon | |
| 1806 Daughter town Potsdam formed | |
| 1859 Daughter town Waddington formed | |
| Massena | |
| 1798 Settled on Revolutionary grants | |
| 1802 Formed as a town | |
| 1805 Daughter town Hopkinton formed | |
| 1806 Daughter town Stockholm formed | |
| 1810 Daughter town Louisville formed | |
| 1825 Daughter town Brasher formed | |
| Morristown | |
| 1799 Settled | |
| 1821 Formed from Town of Oswegatchie | |
| 1827 Daughter town Hammond formed | |
| 1841 Daughter town Macomb formed | |
| Norfolk | |
| 1809 Settled at Raymondsville | |
| 1823 Formed from towns of Louisville and Stockholm | |
| 1844 Ceded land to Town of Louisville | |
| Ogdensburg (city) | |
| 1817 Village of Oswegatchie incorporated | |
| 1868 Formed as a city from Village of Ogdensburg in Town of Oswegatchie | |
| Oswegatchie | |
| Abandoned by British; resettled in 1796 | |
| 1802 Formed from Town of Lisbon | |
| 1806 Daughter town De Kalb formed | |
| 1810 Daughter town Gouverneur formed | |
| 1821 Daughter town Morristown formed | |
| 1825 Daughter town De Peyster formed | |
| 1868 Village of Ogdensburgh became the City of Ogdensburg | |
| Parishville | |
| 1810 Settled | |
| 1818 Formed from Town of Hopkinton | |
| 1843 Daughter town Colton formed | |
| 1851 Ceded land to Town of Colton | |
| Piercefield | |
| 1900 Formed from Town of Hopkinton | |
| 1913 Ceded land to Town of Altamont (now Tupper Lake) Franklin County | |
| Pierrepont | |
| 1806–07 Settled | |
| 1818 Formed from Town of Russell | |
| 1844 Daughter town Fine formed | |
| 1868 Daughter town Clifton formed | |
| 1880 Daughter town Clare formed | |
| Pitcairn | |
| 1824 Settlers from Potsdam | |
| 1836 Formed from Town of Fowler | |
| Potsdam | |
| 1803 Settled | |
| 1806 Formed from Town of Madrid | |
| Rossie | |
| 1807 Settled | |
| 1813 Formed from Town of Russell | |
| 1816 Daughter town Fowler formed | |
| 1818 Scottish immigrants arrived | |
| 1827 Daughter town Hammond formed | |
| 1844 Annexed land from Town of Hammond | |
| Russell | |
| 1804 Settled | |
| 1807 Formed from Town of Hopkinton | |
| 1813 Daughter town Rossie formed | |
| 1816 Daughter town Fowler formed | |
| 1818 Daughter town Pierrepont formed | |
| 1844 Daughter town Fine formed | |
| Stockholm | |
| 1802 Settled | |
| 1806 Formed from Town of Massena | |
| 1823 Daughter town Norfolk formed | |
| Waddington | |
| 1798 Settled | |
| 1859 Formed from Town of Madrid | |