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List of towns, formation dates, and other details
| Augusta | |
| In Ontario County 1789-1823 | |
| Avon | |
| In Ontario County 1789-1821 (named Hartford 1789-1808) | |
| Benton | |
| In Ontario County 1803-1823 | |
| Bloomfield | |
| Name for Town of East Bloomfield 1789-1833 | |
| Boyle | |
| Name for Town of Smallwood 1808-1812 | |
| Brighton | |
| In Ontario County 1814-1821 | |
| Bristol | |
| 1788 Settled at Old Indian Orchard | |
| 1789 Formed from Montgomery County | |
| 1838 Daughter town South Bristol formed | |
| 1848 Ceded land to Town of Richmond | |
| 1852 Annexed land to Town of Richmond | |
| Burt | |
| Name for Town of Manchester 1821-1822 | |
| Canadice | |
| 1804 Settlers from Vermont | |
| 1829 Formed from Town of Richmond | |
| 1836 Ceded land to Town of Richmond | |
| Canandaigua (city) | |
| 1913 Village of Canandaigua incorporated as City of Canandaigua | |
| Canandaigua (town) | |
| 1788 Settled | |
| 1789 Formed from Montgomery county | |
| 1824 Ceded land to Town of Gorham | |
| 1913 Daughter city Canandaigua formed from Village of Canandaigua | |
| East Bloomfield | |
| 1789 Settled; formed as Town of Bloomfield from Montgomery County | |
| 1812 Daughter towns Mendon and Victor formed | |
| 1833 Name changed to East Bloomfield; daughter town West Bloomfield formed | |
| Easton | |
| Name of Gorham 1789-1806 | |
| Farmington | |
| 1789 Settled by Quakers from Berkshire, MA; formed as a town from Montfgomery County | |
| 1821 Daughter town Burt (now Manchester) formed | |
| Freeport | |
| In Ontario 1819-1821 | |
| Geneseo | |
| In Ontario County 1789-1821 | |
| Geneva (city) | |
| 1806 Village of Geneva incorporated in Town of Seneca | |
| 1872 Village of Geneva ceded to new Town of Geneva | |
| 1898 Village of Geneva incorporated as City of Geneva | |
| Geneva (town) | |
| 1872 Formed from the Town of Seneca | |
| 1898 Daughter city Geneva formed from Village od Geneca | |
| Gorham | |
| 1789 Settled at Reed Corners; formed as Town of Easton from Montgomery County | |
| 1806 Name changed to Lincoln | |
| 1807 Name changed to Gorham | |
| 1822 Daughter town Hopewell formed | |
| 1824 Annexed land from Town of Canandaigua | |
| Groveland | |
| In Ontario County 1812-1821 | |
| Henrietta | |
| In Ontario County 1818-1821 | |
| Honeoye | |
| Name for Town of Richmond 1808-1815 | |
| Hopewell | |
| 1789-90 Settled | |
| 1822 Formed from Town of Gorham, Montgomery County | |
| Italy | |
| In Ontario County 1815-1823 | |
| Jerusalem | |
| In Ontario County 1789-1823 | |
| Lima | |
| In Ontario County 1789-1821 | |
| Lincoln | |
| Name for Town of Gorham 1806-1807 | |
| Livonia | |
| In Ontario County 1808-1821 | |
| Lyon | |
| In Ontario County 1811-1823 | |
| Manchester | |
| 1793 Settled | |
| 1821 Formed as Town of Burt from Town of Framington | |
| 1822 Name changed to Manchester | |
| Mendon | |
| In Ontario County 1812-1821 | |
| Middlesex | |
| In Ontario County 1879-1808 | |
| Middletown | |
| Name for Town of Naples 1789-1808 | |
| Milo | |
| In Ontario County 1818-1823 | |
| Naples | |
| 1779 Settled and known as Watkinstown | |
| 1789 Formed as Town of Middletown from Montgomery County | |
| 1808 Name changed to Naples | |
| 1815 Daughter town Italy formed | |
| 1816 Daughter town Springwater formed | |
| Northfield | |
| Name for Town of Smallwood 1792-1808 | |
| Ontario | |
| In Ontario County 1807-1823 | |
| Palmyra | |
| In Ontario County 1789-18234 | |
| Penfield | |
| In Ontario County 1810-1821 | |
| Perinton | |
| In Ontario County 1812-1821 | |
| Phelps | |
| 1788-90s Part of townships 10 and 11 purchased from Phelps and Gorham; distinct called Sullivan; early settlers from Columbia County | |
| 1796 Formed as Town of Phelps | |
| 1823 Land ceded to Town of Lyons, Wayne County | |
| Pittsford | |
| In Ontario County 1814-1821 | |
| Pittstown | |
| Name for Town of Richmond 1796-1808 | |
| Richmond | |
| 1789 Settled | |
| 1796 Formed as Town of Pittstown | |
| 1808 Name changed to Honeoye; daughter town Livonia formed | |
| 1815 Name changed to Richmond | |
| 1829 Daughter town Canadice formed | |
| 1836 Annexed land from Town of Canadice | |
| 1848 Annexed land from towns of Bristol and South Bristol | |
| 1852 Ceded land to towns of Bristol and South Bristol | |
| Rush | |
| In Ontario County 1818-1821 | |
| Seneca | |
| 1787 Settlers from New England on site of Indian village Kanadesga | |
| 1793 Formed as a town | |
| 1872 Daughter town Geneva formed | |
| Smallwood (1792-1814) | |
| 1792 District of Northfield formed from seven townships northeast of Genesee River | |
| 1796 District of Northfield was organized as Town of Northfield | |
| 1808 Town of Northfield renamed Boyle | |
| 1810 Daughter town Penfield formed | |
| 1812 Daughter town Perinton | |
| 1813 Town of Boyle renamed Smallwood | |
| 1814 Smallwood dissolved and divided into towns of Brighton and Pittsford | |
| Sodus | |
| In Ontario County 1789-1823 | |
| South Bristol | |
| 1789 Settlers from Massachusetts at Wilburs Points | |
| 1838 Formed from Town of Bristol | |
| 1848 Ceded land to Town of Richmond | |
| 1852 Annexed land from Town of Richmond | |
| Sparta | |
| In Ontario County 1789-1821 | |
| Springwater | |
| In Ontario County 1816-1821 | |
| Victor | |
| 1789 Settlers from Stockbridge, MA | |
| Watkinstown | |
| Name for Town of Naples 1779-1789 | |
| West Bloomfield | |
| 1789 Settled | |
| 1833 Formed from Town of East Bloomfield | |
| Williamson | |
| In Ontario County 1802-1823 | |