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List of towns, formation dates, and other details
| Brookfield | |
| 1791 Settled at Five Corners | |
| 1795 Formed in Herkimer County from Town of Paris (now in Oneida County) | |
| 1798 Transferred to new county of Chenango | |
| 1805 Daughter town Columbus formed in Chenango County | |
| 1806 Brookfield transferred to new county of Madison | |
| Cazenovia | |
| 1793 Settled by Dutch | |
| 1795 Formed in Herkimer County from towns of Paris and Whitestown | |
| 1798 Transferred to new county of Chenango; daughter town De Ruyter formed | |
| 1803 Daughter town Sullivan formed | |
| 1806 Transferred to new county of Madison | |
| 1807 Daughter towns Nelson and Smithfield formed | |
| 1823 Daughter town Fenner formed | |
| DeRuyter | |
| 1793 Settled | |
| 1798 Formed in Chenango County from Town of Cazenovia | |
| 1806 Transferred to new county of Madison; daughter town German formed in Chenango County | |
| 1815 Daughter town Georgetown formed | |
| Eaton | |
| 1793 Settlers from Vermont and Massachusetts | |
| 1807 Formed from Town of Hamilton | |
| Fenner | |
| 1793 Settled | |
| 1823 Formed from towns of Cazenovia and Smithfield | |
| Georgetown | |
| 1804 Settled | |
| 1815 Formed from Town of De Ruyter | |
| Hamilton | |
| 1792 Settlers from Massachusetts and Scotland | |
| 1795 Formed in Herkimer County from Town of Paris (now in Oneida County) | |
| 1798 Transferred to new county of Chenango | |
| 1806 Transferred to new county of Madison | |
| 1807 Daughter towns Eaton, Lebanon, and Madison formed | |
| Lebanon | |
| 1792 Settlers from Vermont | |
| 1807 Formed from Town of Hamilton | |
| Lenox | |
| 1792 Settled | |
| 1809 Formed from Town of Sullivan | |
| 1836 Daughter town Stockbridge formed | |
| 1896 Daughter towns Lincoln and Oneida (now City of Oneida) formed | |
| Lincoln | |
| 1896 Formed from Town of Lenox | |
| Madison | |
| 1793 Settled | |
| 1807 Formed from Town of Hamilton | |
| Nelson | |
| 1794 Settled | |
| 1807 Formed from Town of Cazenovia | |
| Oneida (city) | |
| 1901 Town of Oneida incorporated as the City of Oneida | |
| Oneida (town) 1896–1901 | |
| 1896 Formed from Town of Lenox including Village of Oneida | |
| 1901 Incorporated as a city | |
| Smithfield | |
| 1795 Settled | |
| 1807 Formed from Town of Cazenovia | |
| 1823 Daughter town Fenner formed | |
| 1836 Daughter town Stockbridge formed | |
| Stockbridge | |
| 1791 Settled | |
| 1836 Formed from towns of Augusta, Lenox, Smithfield, and Vernon | |
| Sullivan | |
| 1790 Settled | |
| 1803 Formed in Chenango County from Town of Cazenovia | |
| 1806 Transferred to new county of Madison | |
| 1809 Daughter town Lenox formed |
Selected links to town websites, clerks, and historians
Brookfield (town)
Canastota (village)
Cazenovia (village)
Cazenovia (town)
Chittenango (village)
DeRuyter (village)
DeRuyter (town)
Earlville (village)
Eaton (town)
Fenner (town)
Georgetown (town)
Hamilton (village)
Hamilton (town)
Lebanon (town)
Lenox (town)
Lincoln (town)
Madison (town)
Morrisville (village)
Munnsville (village)
Nelson (town)
Oneida (city)
Smithfield (town)
Stockbridge (town)
Sullivan (town)
Wampsville (village)