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List of towns, formation dates, and other details
| Albion | |
| 1812 Settled | |
| 1825 Formed from Town of Richland | |
| Amboy | |
| 1805 Settlers from Connecticut | |
| 1830 Formed from Town of Williamstown | |
| Boylston | |
| 1810-12 Settlers from Canajoharie, Otsego County | |
| 1828 Formed from Town of Orwell | |
| Constantia | |
| 1786 Settled by French | |
| 1808 Formed in Oneida County from Town of Mexico | |
| 1816 Transferred to new county of Oswego | |
| 1825 Daughter town Hastings formed | |
| 1839 Daughter town West Monroe formed | |
| Fredericksburgh | |
| Name for Town of Volney 1806-1811 | |
| Fulton (city) | |
| 1902 Incorporated as a city; formed from Village of Oswego Falls (Town of Granby) and Village of Fulton (Town of Volney) | |
| Granby | |
| 1792 Settlers from Rensselaer County | |
| 1818 Formed from Town of Hannibal | |
| 1836 Ceded land to Town of Oswego Falls | |
| 1902 Daughter City of Fulton formed from Village of Oswego Falls | |
| Hannibal | |
| 1802 Settlers from Saratoga County | |
| 1806 Created in Onondaga County from the town of Lysander | |
| 1816 Transferred to new county of Oswego formed | |
| Hastings | |
| 1789 Settled at Fort Brewerton | |
| 1825 Formed from Town of Constantia | |
| 1789 Settled at Fort Brewerton | |
| 1825 Formed from Town of Constantia | |
| Mexico | |
| 1792 Formed from Town of Whitestown in Herkimer County | |
| 1798 Transferred to new county of Oneida | |
| 1799 Daughter town Camden formed | |
| 1800 Daughter towns Champion and Watertown formed in Jefferson County; Redfield in Oneida County; Lowville and Turin in Lewis County | |
| 1802 Daughter town Adams formed in Jefferson County | |
| 1803 Daughter town Ellisburgh formed in Jefferson County | |
| 1804 Daughter towns Malta (now Lorraine), formed in Jefferson County and Williamstown Oneida County | |
| 1806 Daughter town Fredericknurgh (now Volney) formed | |
| 1808 Daughter town Constantia formed | |
| 1813 Daughter town New Haven formed | |
| 1816 Mexico transferred from Oneida County to new county of Oswego | |
| 1828 Daughter town Parish formed | |
| 1836 Annexed land from towns of New Haven and Richland | |
| Minetto | |
| 1916 Formed from Town of Oswego | |
| New Haven | |
| 1798 First Settled | |
| 1813 Formed in Oneida County from Town of Mexico | |
| Orwell | |
| 1806 Settled | |
| 1817 Formed from Town of Richland | |
| 1828 Daughter town Boylston formed | |
| 1844 Annexed land from Town of Richland | |
| Oswego (city) | |
| Site of British garrison during Revolutionary War | |
| 1828 Incorporated as a village in towns of Oswego and Scriba | |
| 1848 Enlarged and formed as a city from towns of Oswego and Scriba | |
| Oswego (town) | |
| 1797 Settlers from Connecticut | |
| 1818 Formed from Town of Granby | |
| 1836 Annexed land from Town of Granby | |
| 1848 Daughter city Oswego formed | |
| 1916 Daughter town Minetto formed | |
| Palermo | |
| 1806 Settlers from Oneida County | |
| 1832 Formed from Town of Volney | |
| Parish | |
| 1803 Settlers from Otsego County | |
| 1828 Formed from Town of Mexico | |
| Redfield | |
| 1795-98 Settlers from Connecticut at Redfield Square | |
| 1800 Formed in Oneida County from Town of Mexico | |
| 1816 Transferred to new county of Oswego | |
| Richland | |
| 1801 Settlers from Rome, NY | |
| 1807 Formed in Oneida County from Town of Mexico from Town of Williamstown | |
| 1816 Transferred to new county of Oswego | |
| 1817 Daughter town Orwell formed | |
| 1825 Daughter towns Albion and Sandy Creek formed | |
| 1836 Ceded land to Town of Mexico | |
| 1844 Ceded land to Town of Orwell | |
| Sandy Creek | |
| 1804 Settlers from Oneida County | |
| 1825 Formed from Town of Richland | |
| Schroeppel | |
| 1800 Settled at Phoenix | |
| 1832 Formed from Town of Volney | |
| Scriba | |
| 1798 Settled | |
| 1811 Formed in Oneida County from Town of Frederickburgh (now Volney) | |
| 1816 Transferred to new county of Oswego | |
| 1848 Daughter city Oswego formed | |
| Volney | |
| Settled temporarily in early 1700s | |
| 1793 Settled | |
| 1806 Formed in Oneidca County as Town of Frederickburgh from Town of Mexico | |
| 1811 Name change to Volney; daughter town Scriba formed | |
| 1816 Transferred to new county of Oswego | |
| 1832 Daughter towns Palermo and Schroeppel formed | |
| 1902 Daughter city Fulton formed | |
| West Monroe | |
| 1806 Settled | |
| 1839 Formed from Town of Constantia | |
| Williamstown | |
| 1801 Settled | |
| 1804 Formed in Oneida County from Town of Mexico | |
| 1807 Daughter town Richland formed | |
| 1816 Transferred to new county of Oswego | |
| 1830 Daughter town Amboy formed | |