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List of towns, formation dates, and other details
| Arcadia | |
| 1791 Settled | |
| 1825 Formed from Town of Lyons | |
| Butler | |
| 1802 – 03 Settled | |
| 1826 Formed from Town of Wolcott | |
| Galen | |
| 1800 Settled | |
| 1812 Formed in Seneca County from Town of Junius | |
| 1823 Transferred to new county of Wayne | |
| 1824 Daughter town Savannah formed | |
| Huron | |
| 1796 Settled | |
| 1826 Formed as Town of Port Bay from Town of Wolcott | |
| 1834 Name changed to Huron | |
| Lyons | |
| 1789 Settled | |
| 1811 Formed in Ontario County from Town of Sodus | |
| 1823 transferred to new county of Wayne; land annexed from Town of Phelps, Ontario County | |
| 1825 Daughter town Arcadia formed | |
| Macedon | |
| 1789 Settled | |
| 1823 Formed from Town of Palmyra | |
| Marion | |
| 1795 – 06 Settled | |
| 1825 Formed as Town of Winchester from Town of Williamson | |
| 1826 Name changed to Marion | |
| Ontario | |
| 1806 Settlers from Rhode Island | |
| 1807 Formed in Ontario County as Town of Freetown from Town of Williamson | |
| 1808 Name changed to Ontario | |
| 1823 Transferred to new county of Wayne | |
| 1829 Daughter town Walworth formed | |
| Palmyra | |
| 1789 Created as district of Tolland in Ontario County | |
| 1796 Named Town of Palmyra | |
| 1823 Transferred to new county of Wayne; daughter town Macedon formed | |
| Port Bay | |
| Name for Town of Huron 1826 - 1834 | |
| Rose | |
| 1805 Settled | |
| 1826 Formed from Town of Wolcott | |
| Savannah | |
| 1812 Settled | |
| 1824 Formed from Town of Galen | |
| Sodus | |
| 1789 Formed in Ontario County | |
| 1802 Daughter town Williamson formed | |
| 1811 Daughter town Lyons formed | |
| 1823 Transferred to new county of Wayne | |
| Walworth | |
| 1800 Settled | |
| 1829 Formed from Town of Ontario | |
| Williamson | |
| 1802 Formed in Ontario County from Town of Sodus | |
| 1807 Daughter town Freetown (now Ontario) formed | |
| 1823 Transferred to new county of Wayne | |
| 1825 Daughter town Winchester (now Marion) was formed | |
| Wolcott | |
| 1805 Settled | |
| 1807 Formed in Seneca County from the Town of Junius | |
| 1823 Transferred to new county of Wayne | |
| 1826 Daughter towns Butler, Port Bay (now Huron), and Rose formed | |