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List of towns, formation dates, and other details
| Adams | |
| 1801 Settled | |
| 1802 Formed in Oneida County from Town of Mexico | |
| 1804 Daughter town Harrison (now Rodman) formed | |
| 1805 Transferred to new county of Jefferson | |
| Alexandria | |
| 1811 Settled | |
| 1821 Formed from towns of Brownville and Le Ray | |
| 1841 Daughter town Theresa formed | |
| Antwerp | |
| 1803 Settled at Ox Bow | |
| 1810 Formed from Town of Le Ray | |
| Brownville | |
| 1799 Settled | |
| 1802 Formed in Oneida County from Town of Leyden | |
| 1805 Transferred to new county of Jefferson | |
| 1806 Daughter town Le Ray formed | |
| 1818 Daughter town Lyme formed | |
| 1819 Daughter town Pamelia formed | |
| 1821 Daughter towns Alexandria and Orleans formed | |
| Cape Vincent | |
| c. 1778 Fort built on Carlton Island | |
| 1801 Settled on mainland at Port Putnam | |
| 1849 Formed from Town of Lyme | |
| Champion | |
| 1797–98 Settled | |
| 1800 Formed in Oneida County from Town of Mexico | |
| 1803 Daughter town Harrisburg(h) formed in Oneida County | |
| 1805 Transferred to new county of Jefferson | |
| Clayton | |
| Includes part of Penet’s Square (land tract) | |
| 1803 Settled | |
| 1833 Formed from towns of Lyme and Orleans | |
| Ellisburg(h) | |
| 1797 Settled | |
| 1803 Formed in Oneida County from Town of Mexico | |
| 1805 Transferred to new county of Jefferson | |
| 1806 Daughter town Henderson formed | |
| Harrison | |
| Name for Town of Rodman 1804–1808 | |
| Henderson | |
| 1802 Settled | |
| 1806 Formed from Town of Ellisburgh | |
| Hounsfield | |
| 1800 Settled | |
| 1806 Formed from Town of Watertown | |
| LeRay | |
| 1802 Settled | |
| 1806 Formed from Town of Brownville | |
| 1810 Daughter town Antwerp formed | |
| 1813 Daughter town Wilna formed | |
| 1821 Daughter towns Alexandria and Philadelphia formed | |
| Lorraine | |
| 1802 Settled | |
| 1804 Formed in Oneida County as Malta from Town of Mexico | |
| 1805 Transferred to new county of Jefferson | |
| 1808 Name changed to Lorraine | |
| 1848 Daughter town Worth formed | |
| Lyme | |
| 1801 Settled | |
| 1818 Formed from Town of Brownville | |
| 1833 Daughter town Clayton formed | |
| 1849 Daughter town Cape Vincent formed | |
| Malta | |
| Name for Town of Lorraine 1804–1808 | |
| Orleans | |
| Includes part of Penet’s Square (land tract) | |
| 1806 Settled | |
| 1821 Formed from Town of Brownville | |
| 1829 Ceded land to Town of Pamelia | |
| 1833 Daughter town Clayton formed | |
| Pamelia | |
| Includes part of Penet’s Square (land tract) | |
| 1799 Settled | |
| 1819 Formed from Town of Brownville | |
| 1824 Name changed to Leander and restored to Pamelia | |
| 1829 Annexed land from Town of Orleans | |
| 1869 Ceded land to new City of Watertown | |
| Philadelphia | |
| 1804 Settled by Quakers from Pennsylvania and New Jersey | |
| 1821 Formed from Town of Le Ray | |
| Rodman | |
| 1801 Settled | |
| 1804 Formed in Oneida County as Town of Harrison from Town of Adams | |
| 1805 Transferred to new county of Jefferson | |
| 1808 Name changed to Rodman; daughter town Pinckney formed in Lewis County | |
| Rutland | |
| 1799 Settled | |
| 1802 Formed in Oneida County from Town of Watertown | |
| 1805 Transferred to new county of Jefferson | |
| Theresa | |
| 1841 Formed from Town of Alexandria | |
| Watertown (city) | |
| 1816 Village of Watertown formed in Town of Watertown | |
| 1869 Incorporated as a city; formed from Village of Watertown and land annexed from Town of Pamelia | |
| Watertown (town) | |
| 1800 Settled and formed in Oneida County from Town of Mexico | |
| 1802 Daughter town Rutland formed | |
| 1805 Transferred to new county of Jefferson | |
| 1806 Daughter town Hounsfield formed | |
| 1869 Daughter city Watertown formed | |
| Wilna | |
| 1798 Settled at Carthage | |
| 1813 Formed from towns of Leyden, Lewis County, and Le Ray | |
| Worth | |
| 1802 Settled by an association from Litchfield, Herkimer County | |
| 1816–17 Settlement abandoned | |
| 1848 Formed from Town of Lorraine |