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List of towns, formation dates, and other details
| Augusta | |
| Name for Town of Middlesex 1789 – 1808 | |
| Barrington | |
| 1800 Settled | |
| 1822 Formed in Steuben County from Town of Wayne | |
| 1826 Transferred to Yates County | |
| Benton | |
| 1789 Settlers from Catskill, Greene County | |
| 1803 Formed in Ontario County as Town of Vernon from Town of Jerusalem | |
| 1808 Name changed to Snell | |
| 1810 Name changed to Benton | |
| 1818 Daughter town Milo formed | |
| 1823 Transferred to new county of Yates | |
| 1851 Daughter town Torrey formed | |
| Italy | |
| 1793 Settled at West Hollow | |
| 1815 Formed in Ontario County from Town of Naples | |
| 1823 Transferred to new county of Yates | |
| Jerusalem | |
| 1789 Formed in Ontario County; settled the same year | |
| 1803 Daughter town Vernon (now Benton) formed | |
| 1814 Annexed land from Town of Wayne, Steuben County | |
| 1823 Transferred to new county of Yates | |
| Middlesex | |
| 1789 Settled | |
| 1797 formed as town of Augusta in Ontario County | |
| 1808 Name changed to Middlesex | |
| 1814 Annexed land from Town of Wayne, Steuben County | |
| 1823 Transferred to new county of Yates | |
| 1832 Daughter town Potter formed | |
| 1856 Ceded land to Town of Potter | |
| Milo | |
| 1788 – 89 Settlers from Rhode Island from Town of Benton | |
| 1823 Transferred to new county of Yates | |
| 1851 Daughter town Torrey formed | |
| Potter | |
| 1788 Settled | |
| 1823 Formed from Town of Middlesex | |
| 1856 Annexed land from Town of Middlesex | |
| Snell | |
| Name for Town of Benton 1808 – 1810 | |
| Starkey | |
| 1800 Settled | |
| 1824 Formed from Town of Reading, Steuben County | |
| Torrey | |
| 1788 Settlers from New England | |
| 1851 Formed from towns of Benton and Milo | |
| Vernon | |
| Name for Town of Benton 1803 – 1808 | |