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List of towns, formation dates, and other details
| Blooming Grove | |
| 1735 Settled | |
| 1799 Formed from Town of Cornwall | |
| 1830 Daughter town Hamptonburgh formed | |
| 1845 Daughter town Chester formed | |
| Calhoun | |
| ` | Name for Town of Mount Hop 1825-1833 |
| Chesecocks | |
| Name for Town of Monroe 1799-1801 | |
| Chester | |
| 1716 Settlers from Long Island at Gray Court | |
| 1845 Formed from towns of Blooming Grove, Goshen, Monroe, and Warwick | |
| Clarkstown | |
| In Orange County 1791-1798 | |
| Cornwall | |
| Part of Evans and Chesecock patents | |
| 1714 Included in Goshen Precinct | |
| 1720 Settled | |
| 1764 Formed as New Cornwall Precinct from Goshen Precinct | |
| 1788 Recognized as Town of New Cornwall by the State of New York | |
| 1797 Name changed to Cornwall | |
| 1799 Daughter towns Blooming Grove and Chesecocks (now Monroe) formed | |
| 1872 Daughter town Highlands formed | |
| Crawford | |
| Settled before 1779 | |
| 1823 Formed from Town of Montgomery | |
| Deerpark | |
| 1690 Settled | |
| 1798 Formed from Town of Mamakating, Ulster County, and Town of Minisink | |
| 1825 Daughter town Calhoun (now Mount Hope) formed | |
| 1907 Daughter city Port Jervis formed from Village of Port Jervis | |
| Goshen | |
| 1703 Included in Wawayanda Patent | |
| 1714 Included in Goshen Precinct, later formed as Goshen township | |
| 1764 Daughter precinct New Cornwall (now Cornwall) formed | |
| 1788 Recognized as a town by the State of New York; daughter towns Minisink and Warwick formed | 1788 Recognized as a town by the State of New York; daughter towns Minisink and Warwick formed |
| 1830 Daughter town Hamptonburgh formed | |
| 1845 Daughter town Chester formed | |
| Greenville | |
| 1720-30 Settled | |
| 1853 Formed from Town of Minisink | |
| Hamptonburg(h) | |
| 1719-20 Settled | |
| 1830 Formed from towns of Blooming Grove Goshen, Montgomery, New Windsor, and Wallkill | |
| Haverstraw | |
| In Orange County 1719-1798 | |
| Highlands | |
| 1872 Formed from Town of Cornwall | |
| Middletown (city) | |
| 1848 Village of Middletown incorporated in Town of Wallkill | |
| 1888 Village incorporated as City of Middletown | |
| 1968 Annexed Village of Amchir from Town of Wawayanda | |
| Minisink | |
| 1703 Included in Wawayanda | |
| 1704 Minisink Patent granted | |
| 1788 Formed as a town from Town of Goshen | |
| 1798 Daughter town Deerpark formed | |
| 1825 Daughter town Calhoun (now Mount Hope) formed | |
| 1849 Daughter town Wawayanda formed | |
| 1853 Daughter town Greenville formed | |
| Monroe | |
| 1707 Part of Chesecock Patent | |
| 1742 Settled | |
| 1799 Formed as Town of Chesecocks from Town of Cornwall | |
| 1801 Name changed to Southfield | |
| 1808 Name changed to Monroe | |
| 1845 Daughter town Woodbury formed | |
| 1863 Daughter town Woodbury formed | |
| 1865 Woodbury dissolved and returned to Monroe | |
| 1889 Daughter town Woodbury recreated | |
| 1890 Daughter town Tuxedo formed | |
| Montgomery | |
| 1694 Part of Evans Patent | |
| 1708 New land patents begin to be issues for former Evans Patent land | |
| 1714 Included in Shawangunk Precinct | |
| 1743 Par of Wallkill Precinct | |
| 1772 Hanover Precinct formed from Wallkill Precinct in Ulster County | |
| 1782 Name changed to Montgomery Precinct | |
| 1788 Recognized as a town in Ulster County by the State of New York | |
| 1798 Transferred to Orange County | |
| 1823 Daughter town Crawford formed | |
| 1830 Daughter town Hamptonburgh formed | |
| Mount Hope | |
| 1825 Formed as Town of Calhoun from towns of Deerpark, Minisink, and Wallkill | |
| 1833 Name changed to Mount Hope | |
| Newburgh (city) | |
| 1800 Village of Newburgh | |
| 1865 Village inc. as City of Newburgh | |
| Newburgh (town) | |
| Part of Evans Patent and Highlands Precinct | |
| 1708-09 Settled by German Palatines | |
| 1762 Formed as Newburgh Precinct from Precinct of the Highlands in Ulster County | |
| 1772 Daughter precinct New Marlborough formed in Ulster County | |
| 1788 Recognized as a town in Ulster County by the State of New York | |
| 1798 Transferred to Orange County | |
| 1865 Daughter city Newburgh formed from Village of Newburgh | |
| New Cornwall | |
| Name for Town of Cornwall 1788-1797 | |
| New Hampstead | |
| In Orange County 1791-1798 | |
| New Windsor | |
| Part of Highlands Precinct | |
| 1685-86 Settled by Scots at Plum Point | |
| 1762 Formed as New Windsor Precinct from Precinct of the Highlands in Ulster County | |
| 1788 Recognized as a town in Ulster County by the State of New York | |
| 1798 Transferred to Orange County | |
| 1830 Daughter town Hamptonburgh formed | |
| Orangetown | |
| In Orange County 1686-1798 | |
| Port Jervis (city) | |
| 1853 Village of Port Jervis incorporated in Town of Deerpark | |
| 1907 Village incorporated as City of Port Jervis | |
| Southfield | |
| Name for Town of Monroe 1801-1808 | |
| Tuxedo | |
| 1890 Formed from Town of Monroe | |
| Wallkill | |
| Part of Minisink Patent | |
| 1743 Wallkill Precinct formed in Ulster County | |
| 1772 Daughter precinct Hanover (now Montgomery) formed | |
| 1788 Recognized as a town in Ulster County | |
| 1798 Transferred to Orange County | |
| 1825 Daughter town Calhoun (now Mount Hope) formed | |
| 1830 Daughter town Hamptonburgh formed | |
| 1888 Daughter city Middletown formed from Village of Middletown | |
| Warwick | |
| Part of Wawayanda Patent | |
| 1714 Included in Goshen Precinct | |
| 1719 First deed of sal in the town area already known as Warwick | |
| 1788 Formed as a town from Town of Goshen | |
| 1845 Daughter town Chester formed | |
| Wawayanda | |
| Settled before 1700 | |
| 1849 Formed from Town of Minisink | |
| 1968 Village of Amchir ceded to City of Middleton | |
| Woodbury | |
| 1863 Formed from Town of Monroe | |
| 1865 Town dissolved and returned to Monroe | |
| 1889 Town reestablished | |