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List of towns, formation dates, and other details
| Addison | |
| 1791 Settled | |
| 1796 Formed as Town of Middletown in new county of Steuben | |
| 1808 Name changed to Addison; daughter town Troupsburg(h) formed | |
| 1822 Daughter town Cameron formed | |
| 1828 Daughter town Woodhull formed | |
| 1856 Daughter town Rathbone formed | |
| 1859 Daughter town Tuscarora formed | |
| Avoca | |
| c. 1790 Settled | |
| 1843 Formed from towns of Bath, Cohocton, Howard, and Wheeler | |
| Barrington | |
| In Steuben County 1822–1826 | |
| Bath | |
| 1793 Settled by 15 families, mostly German and Scottish | |
| 1796 Formed as town in new county of Steuben | |
| 1808 Daughter town Pulteney formed | |
| 1812 Daughter towns Cohocton and Howard formed | |
| 1820 Daughter town Wheeler formed | |
| 1822 Daughter town Urbana formed | |
| 1839 Annexed land from Town of Urbana | |
| 1843 Daughter town Avoca formed | |
| Bradford | |
| 1793 Settlers from New Jersey | |
| 1836 Formed from Town of Jersey (now Orange) | |
| Cameron | |
| 1800 Settled | |
| 1822 Formed from Town of Addison | |
| 1844 Daughter town Thurston formed | |
| 1856 Daughter town Rathbone formed | |
| Campbell | |
| 1800 Settled | |
| 1831 Formed from Town of Hornby | |
| Canisteo | |
| 1789 Settlers from Pennsylvania | |
| 1796 Formed as a town in new county of Steuben | |
| 1808 Daughter town Troupsburg(h) formed | |
| 1818 Ceded land to Town of Troupsburg(h) | |
| 1820 Daughter town Hornellsville formed | |
| 1827 Daughter towns Greenwood and Jasper formed | |
| Caton | |
| 1819 Settlers from Connecticut | |
| 1839 Formed as Town of Wormly from Town of Painted Post (now Corning) | |
| 1840 Name changed to Caton | |
| Cohocton | |
| 1796 Settled at Bivens Corners | |
| 1812 Formed from towns of Bath and Dansville | |
| 1843 Daughter town Avoca formed | |
| 1848 Daughter town Wayland formed | |
| Corning (city) | |
| 1890 Formed as a city from Village of Corning, Town of Corning | |
| Corning (town) | |
| 1788 Settled | |
| 1796 Formed as Town of Painted Post in new county of Steuben | |
| 1826 Daughter towns Erwin and Hornby formed | |
| 1839 Daughter town Wormly (now Caton) formed | |
| 1852 Name changed to Corning | |
| 1856 Ceded land to Town of Erwin | |
| 1890 Daughter city Corning formed from Village of Corning | |
| Dansville | |
| 1795 Settled | |
| 1796 Formed in new county of Steuben | |
| 1812 Daughter towns Cohocton and Howard formed | |
| 1822 Ceded land, including Dansville village, to Town of Sparta, Livingston County | |
| 1848 Daughter town Wayland formed | |
| 1854 Daughter town Fremont formed | |
| Erwin | |
| 1787 Settled | |
| 1826 Formed from Town of Painted Post (now Corning) | |
| 1837 Daughter town Lindley formed | |
| 1856 Annexed land from Town of Corning | |
| Frederickstown | |
| Name for Town of Wayne 1796–1808 | |
| Fremont | |
| 1812 Settled | |
| 1854 Formed from towns of Dansville, Hornellsville, Howard, and Wayland | |
| Greenwood | |
| 1820 Settled | |
| 1827 Formed from towns of Canisteo and Troupsburg(h) | |
| 1845 Daughter town West Union formed | |
| 1848 Annexed land from Town of Jasper | |
| Hartsville | |
| 1809 Settled | |
| 1844 Formed from Town of Hornellsville | |
| Hornby | |
| 1814 Settlers from Otsego County | |
| 1826 Formed from Town of Painted Post (now Corning) | |
| 1831 Daughter town Campbell formed | |
| Hornell (city) | |
| 1790 Settled at Upper Canisteo | |
| 1852 Village of Hornellsville established in Town of Hornellsville | |
| 1888 Formed as City of Hornellsville from Village of Hornellsville | |
| 1906 Name changed to Hornell | |
| Hornellsville | |
| 1790 Settled at Upper Canisteo | |
| 1820 Formed from Town of Canisteo | |
| 1844 Daughter town Hartsville formed | |
| 1854 Daughter town Fremont formed | |
| 1888 Daughter city Hornellsville (now Hornell) formed from Village of Hornellsville | |
| Howard | |
| 1806 Settled | |
| 1812 Formed from towns of Bath and Dansville | |
| 1843 Daughter town Avoca formed | |
| 1854 Daughter town Fremont formed | |
| Jasper | |
| 1807 Settled | |
| 1827 Formed from towns of Canisteo and Troupsburg(h) | |
| 1848 Ceded land to Town of Greenwood | |
| Lindley | |
| 1790 Settlers from New Jersey | |
| 1837 Formed from Town of Erwin | |
| Middletown | |
| Name for Town of Addison 1796–1808 | |
| Orange | |
| In Steuben County 1813–1854 | |
| Painted Post | |
| Name for Town of Corning 1796–1852 | |
| Prattsburgh | |
| 1801 Settled | |
| 1813 Formed from Town of Pulteney | |
| 1820 Daughter town Wheeler formed | |
| Pulteney | |
| 1802 Settled | |
| 1808 Formed from Town of Bath | |
| 1813 Daughter town Prattsburgh formed | |
| 1848 Ceded land to Town of Urbana | |
| Rathbone | |
| 1793 Settled | |
| 1856 Formed from towns of Addison, Cameron, and Woodhull | |
| Reading | |
| In Steuben County 1806–1854 | |
| Thurston | |
| 1813 Settled at Bonny Hill | |
| 1844 Formed from Town of Cameron | |
| Troupsburg(h) | |
| 1805 Settlers from Connecticut | |
| 1808 Formed from Town of Middletown (now Addison) and Canisteo | |
| 1818 Annexed land from Town of Canisteo | |
| 1827 Daughter towns Greenwood and Jasper formed | |
| 1828 Daughter town Woodhull formed | |
| Tuscarora | |
| 1792–93 Settled | |
| 1859 Formed from Town of Addison | |
| Tyrone | |
| In Steuben County 1822–1854 | |
| Urbana | |
| 1793 Settlers from Pennsylvania at Pleasant Valley | |
| 1822 Formed from Town of Bath | |
| 1839 Ceded land to Town of Bath, annexed land from Town of Wheeler | |
| 1848 Annexed land from Town of Pulteney | |
| Wayland | |
| 1806 Settled | |
| 1848 Formed from towns of Cohocton and Dansville | |
| 1854 Daughter town Fremont formed | |
| Wayne | |
| 1791 Settled | |
| 1796 Formed as Town of Fredericksto(w)n in new county of Steuben | |
| 1806 Daughter town Reading formed | |
| 1808 Name changed to Wayne | |
| 1813 Daughter town Jersey (now Orange) formed | |
| 1814 Ceded land to towns of Jerusalem and Middlesex in Ontario County [ | |
| 1822 Daughter towns Barrington and Tyrone formed | |
| West Union | |
| 1822 Settled at Rexville | |
| 1845 Formed from Town of Greenwood | |
| Wheeler | |
| 1799 Settlers from Albany County | |
| 1820 Formed from towns of Bath and Prattsburgh | |
| 1839 Ceded land to Town of Urbana | |
| 1843 Daughter town Avoca formed | |
| Woodhull | |
| 1805 Settled | |
| 1828 Formed from towns of Addison and Troupsburg(h) | |
| 1856 Daughter town Rathbone formed | |