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List of towns, formation dates, and other details
| Avon | |
| 1785 Settled | |
| 1789 Formed as Hartford in Ontario County | |
| 1808 Name changed to Avon | |
| 1818 Daughter town Rush formed | |
| 1821 Transferred to new county of Livingston | |
| Caledonia | |
| 1797 Settled by Danish | |
| 1802 Formed in Genesee County as Southampton | |
| 1806 Name changed to Caledonia | |
| 1812 Daughter town of Bellona (now Leroy) formed in Genesee County | |
| 1819 Daughter town York formed | |
| 1821 Transferred to new county of Livingston | |
| Charleston | |
| Name for Town of Lima 1789–1808 | |
| Conesus | |
| 1794–95 Settlers from Pennsylvania at Conesus Lake | |
| 1819 Formed in Ontario County as Freeport from towns of Groveland and Livonia | |
| 1821 Transferred to new county of Livingston | |
| Freeport | 1825 Name changed to Bowersville in March, and changed to Conesus in April |
| Name for Town of Conesus 1819–1825 | |
| Geneseo | |
| 1788–89 Settled near Geneseo village | |
| 1789 Formed in Ontario County | |
| 1821 Transferred to new county of Livingston | |
| Groveland | |
| 1792 Settled by Germans at Williamsburgh | |
| 1812 Formed in Ontario County | |
| 1819 Daughter town Conesus formed | |
| 1821 Transferred to new county of Livingston | |
| Hartford | |
| Name for Town of Avon 1789–1808 | |
| Leicester | |
| 1789 Settled | |
| 1802 Formed in Genesee County as Lester from Town of Northampton | |
| 1805 Name changed to Leicester; daughter town Angelica formed [ | |
| 1814 Daughter town Perry formed | |
| 1818 Daughter town Mount Morris formed | |
| 1819 Daughter town York formed | |
| 1821 Transferred to new county of Livingston | |
| Lima | |
| 1788 Settlers from Pennsylvania | |
| 1789 Formed in Ontario County as Charleston | |
| 1808 Name changed to Lima | |
| 1821 Transferred to new county of Livingston | |
| Livonia | |
| 1792 Settlers from Connecticut | |
| 1808 Formed in Ontario County from Town of Pittstown | |
| 1819 Daughter town Conesus formed | |
| 1821 Transferred to new county of Livingston | |
| Mount Morris | |
| 1784–85 Settled | |
| 1818 Formed in Ontario County from Town of Leicester | |
| 1821 Transferred to new county of Livingston | |
| North Dansville | |
| 1795 Settlers from Pennsylvania at Dansville village | |
| 1846 Formed from Town of Sparta | |
| 1849 Annexed land from Town of Sparta | |
| Nunda | |
| 1806 Settled near Nunda village | |
| 1808 Formed in Allegany County from Town of Angelica | |
| 1818 Daughter town Pike formed [ | |
| 1823 Daughter town Eagle formed[ | |
| 1827 Daughter towns Church Tract and Portage formed [ | |
| 1846 Town transferred to Livingston County | |
| Ossian | |
| 1804 Settlers from New Jersey | |
| 1808 Formed in Allegany County from Town of Angelica | |
| 1826 Daughter town Burns formed in Allegany County | |
| 1856/7 Town transferred to Livingston County | |
| Perry | |
| In Livingston County 1814–1841 | |
| Portage | |
| 1810 Settled | |
| 1827 Formed in Allegany County from Town of Nunda | |
| 1846 Town transferred to Livingston County; daughter town Genesee Falls formed in Wyoming County | |
| Sparta | |
| 1789 Formed in Ontario County | |
| 1816 Daughter town Springwater formed | |
| 1821 Transferred to new county of Livingston | |
| 1822 Annexed land, including Dansville village, from Town of Dansville, Steuben County | |
| 1846 Daughter towns North Dansville and West Sparta formed | |
| 1849 Ceded land to Town of North Dansville | |
| Springwater | |
| 1807 Settlers from Connecticut | |
| 1816 Formed in Ontario County from towns of Naples and Sparta | |
| 1821 Transferred to new county of Livingston | |
| West Sparta | |
| 1795 Settled | |
| 1846 Formed from Town of Sparta | |
| York | |
| 1800 Settled by Scottish | |
| 1819 Formed in Genesee County from towns of Caledonia and Leicester | |
| 1821 Transferred to new county of Livingston |
Selected links to town websites, clerks, and historians
Avon
Caledonia
Conesus
Dansville
Geneseo
Groveland
Leicester
Lima
Livonia
Mount Morris
North Dansville
[No website]
Nunda
Ossian
Portage
[No website]
Sparta
[No website]
Springwater
West Sparta
York