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List of towns, formation dates, and other details
| Bleecker | |
| 1800 Settlers from New England | |
| 1831 Formed in Montgomery County from Town of Johnstown | |
| 1838 Transferred to new county of Fulton | |
| 1841 Ceded land to Town of Johnstown | |
| 1842 Daughter town Caroga formed | |
| Broadalbin | |
| First settlement pre-Revolution | |
| 1793 Formed in Montgomery County from Town of Caughnawaga (now towns of Amsterdam, Broadalbin, Johnstown, and Mayfield) | |
| 1799 Daughter town Northampton formed | |
| 1838 Transferred to new county of Fulton | |
| 1842 Ceded land to Town of Perth | |
| Caroga | |
| c. 1790 Settled | |
| 1842 Formed from towns of Bleecker, Johnstown, and Stratford | |
| Ephratah | |
| Settled mid-1700s | |
| 1827 Formed in Montgomery County from Town of Palatine | |
| 1838 Transferred to new county of Fulton | |
| Gloversville (city) | |
| 1853 Village of Gloversville incorporated in Town of Johnstown | |
| 1890 Village of Gloversville incorporated as city of Gloversville | |
| Johnstown (city) | |
| 1808 Village of Johnstown incorporated in Town of Johnstown | |
| 1895 Village of Johnstown incorporated as City of Johnstown | |
| Johnstown (town) | |
| 1760 Settled | |
| 1793 Formed in Montgomery County from Town of Caughnawaga (now towns of Amsterdam, Broadalbin, Johnstown, and Mayfield) | |
| 1812 Daughter town Lake Pleasant formed | |
| 1816 Ceded land to Town of Lake Pleasant, Hamilton County | |
| 1831 Daughter town Bleecker formed | |
| 1837 Daughter town Mohawk formed ✻ | |
| 1838 Transferred to new county of Fulton | |
| 1841 Annexed land from Town of Bleeker | |
| 1842 Daughter town Caroga formed | |
| 1895 Village of Johnstown incorporated as City of Johnstown | |
| Mayfield | |
| c. 1760 First settled as Philadelphia Bush | |
| 1793 Formed in Montgomery County from Town of Caughnawaga (now towns of Amsterdam, Broadalbin, Johnstown, and Mayfield) | |
| 1805 Daughter town Wells formed | |
| 1812 Ceded land to Town of Wells | |
| 1838 Transferred to new county of Fulton | |
| 1842 Ceded land to Town of Perth | |
| 1860 Daughter town Benson formed in Hamilton County | |
| Northampton | |
| c. 1765 Settled | |
| 1799 Formed in Montgomery County from Town of Broadalbin | |
| 1805 Daughter town Wells formed ✻ | |
| 1838 Transferred to new county of Fulton | |
| Oppenheim | |
| Settled pre-Revolution | |
| 1808 Formed in Montgomery County from Town of Palatine | |
| 1838 Transferred to new county of Fulton; daughter town St. Johnsonville formed in Montgomery County | |
| Perth | |
| Pre-Revolution settlers from Scotland | |
| 1831 Formed in Montgomery County from Town of Amsterdam | |
| 1838 Transferred to new county of Fulton | |
| 1842 Annexed land from towns of Broadalbin and Mayfield | |
| Stratford | |
| 1800 Settled | |
| 1805 Formed in Montgomery County from Town of Palatine | |
| 1838 Transferred to new county of Fulton | |
| 1842 Daughter town Caroga formed | |