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List of towns, formation dates, and other details
| Barton | |
| 1791 Settled | |
| 1824 Formed the Town of Tioga | |
| Berkshire | |
| 1791 Settlers at Browns Settlement | |
| 1808 Formed in Broome County from the Town of Tioga (now Town of Owego) | |
| 1822 Town transferred to Tioga County | |
| 1823 Daughter Town of Westville (now Newark Valley) formed | |
| 1831 Daughter town Arlington (now Richford) formed | |
| Big Flats | |
| In Tioga County 1822-1836 | |
| Candor | |
| 1793 Settlers from Connecticut | |
| 1811 Formed from Town of Spencer | |
| Caroline | |
| In Tioga County 1811-1822 | |
| Catharine | |
| In Tioga County 1811-1836 | |
| Catlin | |
| In Tioga County 1823-1836 | |
| Cayuta (1) | |
| In Tioga County 1811-1822 | |
| Cayuta (2) | |
| In Tioga County 1824-1854 | |
| Chemung | |
| In Tioga County 1791-1806 | |
| Chenango | |
| In Tioga County 1791-1806 | |
| Danby | |
| In Tioga County 1811-1822 | |
| Elmira | |
| In Tioga County 1792-1836 | |
| Erin | |
| In Tioga County 1822-1836 | |
| Jericho | |
| In Tioga County 1791-17983 | |
| Lisle | |
| In Tioga County 1801-1806 | |
| Newark | |
| Name for Town of Newark Valley 1824-1862 | |
| Newark Valley | |
| 1791 Settlers from Berkshire County MA | |
| 1823 Formed as Town of Westville from Town of Bershire | |
| 1824 Name changed to Newark | |
| 1862 Name changed to Newark Valley | |
| Nichols | |
| 1787 Settled | |
| 1824 Formed as Town of Tioga | |
| Norwich (town) | |
| In Tioga County 1793-1798 | |
| Owego | |
| Name for Town of Tioga before 1813 | |
| Owego | |
| 1786 Settled at Owego village | |
| 1800 Formed as Town of Tioga from Town of Union in Tioga County | |
| 1806 Transferred to new county of Broome; daughter town Spencer form | |
| 1808 Daughter town of Berkshire | |
| 1813 Name changed to Owego (town of Tioga and Owego changed names) | |
| 1822 Transferred back to Tioga County | |
| Richford | |
| 1831 Formed as Town of Arlington from Town of Berksire | |
| 1832 Name changed to Richford | |
| Southport | |
| In Tioga County 1822-1836 | |
| Spencer | |
| c. 1794 Settled | |
| 1806 Formed from Town of Tioga | |
| 1811 Daughter towns Candor, Caroline, Cayuta (now Newfield), and Danby formed* | |
| 1824 Daughter town Cayuta formed* | |
| Tioga* | |
| Name for Town of Owego before 1813 | |
| Tioga | |
| 1785 Settlers from Wyoming, PA | |
| 1791 Formed as Town of Owego when Tioga County was formed | |
| 1831 Named changed to Tioga (towns of Tioga and Owego switched named) | |
| 1824 Daughter towns Barton and Nichols | |
| Union | |
| In Tioga County 1791-1806 | |
| Veteran | |
| In Tioga County 1823-1836 | |