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List of towns, formation dates, and other details
| Ashland | |
| 1788 Settled | |
| 1867 Formed form towns of Chemung, Elmira, and Southport | |
| Baldwin | |
| 1813 Settled | |
| 1856 Formed from Town of Chemung | |
| Big Flats | |
| 1787 Settled | |
| 1822 Formed in Tioga County from Town of Elmira | |
| 1836 Transferred to new county of Chemung | |
| Catharine | |
| In Chemung County 1836-1854 | |
| Catlin | |
| 1816 Settled | |
| 1823 Formed in Tioga County from Town of Catharine | |
| 1835 Daughter town Dix formed | |
| 1836 Transferred to new county of Chemung | |
| Chemung | |
| 1786 Settled as Buckville | |
| 1788 Formed in Montgomery County | |
| 1791 Transferred to new county of Tioga | |
| 1792 Daughter town Elmira formed | |
| 1822 Daughter town Erin formed | |
| 1836 Transferred to new county of Chemung | |
| 1856 Daughter town Baldwin formed | |
| 1867 Daughter town Ashland formed | |
| Dix | |
| In Chemung County 1836-1854 | |
| Elmira (city) | |
| 1828 Village of Elmira formed in Town of Elmira | |
| 1864 Village incorporated as a city from Village of Elmira and land from Town of Southport | |
| Elmira (town) | |
| 1788 Settled | |
| 1792 Formed in Tioga County as Newtown from Town of Chemung | |
| 1798 Daughter town Catharine formed | |
| 1808 Name changed from Newtown to Elmira | |
| 1822 Daughter towns Big Flats and Southport formed | |
| 1836 Transferred to new county of Chemung | |
| 1854 Daughter town Horseheads formed | |
| 1864 Daughter city Elmira formed from Village of Elmira and Town of | |
| Southport | |
| 1867 Daughter town Ashland formed | |
| Erin | |
| 1817 Settled | |
| 1822 Formed in Tioga County from Town of Chemung | |
| 1836 Transferred to new county of Chemung | |
| 1854 Daughter town van Etten formed | |
| Horseheads | |
| 1788 Settled | |
| 1854 Formed from Town of Elmira | |
| Newtown | |
| Name for Town of Elmira 1792-1808 | |
| Southport | |
| 1788 Settled | |
| 1822 Formed in Tioga County from Town of Elmira | |
| 1836 Transferred to new county of Chemung | |
| 1864 Daughter city Elmira formed | |
| 1867 Daughter town Ashland formed | |
| Van Etten | |
| 1795 Settled | |
| 1854 Formed from towns of Cayuta and Erin | |
| Veteran | |
| 1800 Settlers from Connecticut and Pennsylvania | |
| 1823 Formed in Tioga County from Town of Catharine | |
| 1836 Transferred to new county of Chemung | |