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List of towns, formation dates, and other details
| Bethel | |
| c. 1798 Settled | |
| 1809 Formed from Town of Lumberland | |
| 1828 Daughter town Cochecton formed | |
| Callicoon | |
| 1814 Settled | |
| 1842 Formed from the Town of Liberty | |
| 1851 Daughter town Fremont Formed | |
| Cochecton | |
| Settled pre-Revolution, then abandoned | |
| 1828 Formed from Town of Bethel | |
| 1869 daughter town Delaware formed | |
| Delaware | |
| 1768 Settlers from New Jersey, abandoned during the Revolutionary War | |
| 1869 Formed from Town of Cohecton | |
| Fallsburg(h) | |
| Settled by Germans pre-Revolution, then abandoned | |
| 1826 Formed from the towns of Neversink and Thompson | |
| Forestburgh | |
| Settled pre-Revolution; settled again in 1795 | |
| 1837 Formed form towns of Mamkating and Thompson | |
| Fremont | |
| 1851 Formed from Town of Callicoon | |
| Highland | |
| Settled at Narrow Falls late 1700s | |
| 1853 Formed from town of Lumberland | |
| Liberty | |
| 1793-94 Settlers from Connecticut near Liberty village | |
| 1807 Formed in Ulster County from Town of Lumberland | |
| 1809 Transferred to new county of Sullivan | |
| 1842 Daughter town Callicoon formed, ceded land to Town of Thompson | |
| Mamakating | |
| c. 1700 Settled | |
| 1743 Mamakating precinct formed in Ulster County; area previously called Wagackkemeck and embraced all of future Sullivan County and part of Orange County | |
| 1788 Recognized as a town by State of New York | |
| 1798 Daughter towns formed: Deerpark in Orange County and Lumberland in Ulster County | |
| 1803 Daughter town Thompson formed | |
| 1809 Transferred to new county of Sullivan | |
| 1837 Daughter town Forestburgh | |
| Neversink | |
| 1743 Settled; abandoned during Revolution | |
| 1798 Formed in Ulster County from Town of Rochester | |
| 1809 Transferred to county of Sullivan; daughter town Rockland formed | |
| 1826 Daughter town Fallsburg(h) formed | |
| Rockland | |
| 1789 Settlers from Middletown, CT | |
| 1809 Formed from Town of Neversink | |
| Thompson | |
| Settled at Thompsonville | |
| 1803 Formed in Ulster County from Town of Mamkating | |
| 1809 Transferred to new county of Sullivan | |
| 1826 Daughter town Fallsburg(h) formed | |
| 1837 Daughter town Forestburgh formed | |
| 1842 Annexed land from town of Liberty | |
| Tusten | |
| 1853 Formed from of Lumberland | |