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List of towns, formation dates, and other details
| Burlington | |
| 1790 Settled | |
| 1792 Formed from Town of Otsego | |
| 1797 Daughter town Pittsfield formed | |
| 1808 Daughter town Edmeston formed | |
| Butternuts | |
| Settled before Revolution, abandoned during war | |
| 1787 Resettled | |
| 1796 Formed from Town of Unadilla | |
| 1849 Daughter town Morris formed | |
| 1857 Annexed land from Town of Unadilla | |
| Cherry Valley | |
| 1738-40 Settled by Irish and Scots | |
| 1791 Formed from Town of Canajoharie, Montgomery County | |
| 1792 Daughter town Dorlach (now Sharon, Schoharie County) formed | |
| 1797 Daughter towns Middlefield, Springfield, and Worcester formed | |
| 1854 Daughter town Roseboom formed | |
| Decatur | |
| 1780 Settled | |
| 1808 Formed from Town of Worcester | |
| Dorlach | |
| In Otsego County 1792-1795 | |
| Edmeston | |
| 1763-75 Settled, abandoned during Revolutionary War | |
| 1808 Formed from Town of Burlington | |
| Exeter | |
| 1789 Settled | |
| 1799 Formed from Town of Richfield | |
| Franklin | |
| In Otsego County 1792-1797 | |
| Harpersfield | |
| In Otsego County 1791-1797 | |
| Hartwick | |
| 1761 Hartwick Patent granted | |
| 1802 Formed from Town of Otsego | |
| Huntsville | |
| Name for Town of Otego 1822-1830 | |
| Kortright | |
| In Otsefo Count 1793-1797 | |
| Laurens | |
| 1810 Formed from Town Otsego | |
| Lisbon | |
| Name for Town of New Lisbon 1806-1808 | |
| Maryland | |
| 1790 Settled | |
| 1808 Formed from Town of Worcester | |
| 1817 Daughter town Davenport formed in Delaware County | |
| Middlefield | |
| 1755 Settled by Irish and Scots, abandoned during Revolutionary War | |
| 1797 Formed from Town of Cherry Valley | |
| Milford | |
| 1770 Settled, abandoned during Revolutionary War | |
| 1796 Formed as Suffrage from Town of Unadilla | |
| 1800 Name changed from Suffrage to Milford | |
| 1830 Land ceded to Town of Otego | |
| Morris | |
| c. 1773 Settled, abandoned during Revolutionary War | |
| 1849 Formed from Town of Butternuts | |
| New Lisbon | |
| 1775 Settled, abandoned during Revolutionary War | |
| 1806 Formed as Lisbon from Town of Pittsfield | |
| 1808 Name changed from Lisbon to New Lisbon | |
| Oneonta (city) | |
| 1909 Formed as a city from Village of Oneonta | |
| Oneonta (town) | |
| 1796 Formed as Otego from Town of Unadilla | |
| 1830 Name changed to Oneonta (same year Town of Huntsville renamed Otego) | |
| 1909 City of Oneonta formed from Village of Oneonta | |
| Otego | |
| Settled after Revolution | |
| 1822 Formed as Town of Huntsville from towns of Franklin, Delaware County and Unadilla | |
| 1830 Name changed to Otego; annexed land from Town of Milford | |
| Otego | |
| Name for Town of Oneonta 1796-1830 | |
| Otsego | |
| 1760s Settled, abandoned during Revolutionary War | |
| 1788 Formed as town in Montgomery County; originally included greater part of Otsego and Delaware counties | |
| 1791 Transferred to new county of Otsego | |
| 1792 Daughter towns Burlington, Richfield, and Unadilla formed | |
| 1802 Daughter town Hartwick formed | |
| 1810 Daughter town Laurens formed | |
| Pittsfield | |
| 1793 Settled | |
| 1797 Formed from Town of Burlington | |
| 1806 Daughter town Lisbon (now New Lisbon) formed | |
| Plainfield | |
| 1793 Settled | |
| 1799 Formed from Town of Richfield | |
| 1816 Daughter town Winfield, Herkimer County, formed | |
| Richfield | |
| Settled before Revolution, abandoned during war | |
| 1787 Resettled | |
| 1792 Formed from Town of Otsego | |
| 1799 Daughter towns Exeter and Plainfield formed | |
| 1816 Daughter town Winfield, Herkimer County, formed | |
| Roseboom | |
| 1800 Settled | |
| 1854 Fored from Town of Cherry Valley | |
| Suffrage | |
| Name of Town of Milford 1796-1800 | |
| Unadilla | |
| Settled before Revolution, abandoned during war | |
| 1792 Formed from Town of Otsego | |
| 1796 Daughter towns Butternuts, Suffrage (now Milford), and Otego (now Oneonta) formed | |
| 1822 Daughter town Huntsville (now Otego) formed | |
| 1857 Land ceded to Town of Butternuts | |
| Westford | |
| 1787 Settled | |
| 1808 Formed from Town of Worcester | |
| Worcester | |
| 1788-90 Settled | |
| 1797 Formed from Town of Cherry Valley | |
| 1808 Daughter towns of Decatur, Maryland, and Westford formed | |