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List of towns, formation dates, and other details
| Covert | |
| c. 1793 Settled at Goodwins Point | |
| 1817 Formed in new Tompkins County from Town of Ovid | |
| 1819 Transferred back to Seneca County | |
| 1826 Daughter town Lodi formed | |
| Fayette | |
| 1789 Settlers from Pennsylvania | |
| 1800 Formed in Cayuga County as Town of Washington from Town of Romulus | |
| 1803 Daughter town Junius formed | |
| 1804 Transferred to new county of Seneca | |
| 1808 Name changed to Fayette | |
| Galen | |
| In Seneca County 1812–1823 | |
| Hector | |
| In Seneca County 1804–1817 | |
| Junius | |
| 1795 Settled | |
| 1803 Formed in Cayuga County from Town of Washington (now Fayette) | |
| 1804 Transferred to new county of Seneca | |
| 1807 Daughter town Wolcott formed | |
| 1812 Daughter town Galen formed | |
| 1829 Daughter towns Seneca Falls, Tyre, and Waterloo formed | |
| Lodi | |
| 1789 Settlers from Pennsylvania | |
| 1826 Formed from Town of Covert | |
| Ovid | |
| 1789 Settlers from New Jersey and Pennsylvania | |
| 1794 Formed as a town in Onondaga County | |
| 1799 Transferred to new county of Cayuga | |
| 1802 Daughter town Hector formed | |
| 1804 Transferred to new county of Seneca | |
| 1817 Daughter town Covert formed in new Tompkins County | |
| Romulus | |
| 1789 Settled | |
| 1794 Formed as a town in Onondaga County | |
| 1799 Transferred to new county of Cayuga | |
| 1800 Daughter town Washington (now Fayette) formed | |
| 1804 Transferred to new county of Seneca | |
| 1830 Daughter town Varick formed | |
| Seneca Falls | |
| 1787 Settlers from Ulster County | |
| 1829 Formed from Town of Junius | |
| Tyre | |
| 1794 Settlers from New Jersey | |
| 1829 Formed from Town of Junius | |
| Varick | |
| 1789 Settled | |
| 1830 Formed from Town of Romulus | |
| Washington | |
| Name for Town of Fayette 1800–1808 | |
| Waterloo | |
| 1759 Settlers from Rhode Island | |
| 1829 Formed from Town of Junius | |
| Wolcott | |
| In Seneca County 1807–1823 | |