New York County Creation Dates and Parent CountiesEdit This Page
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United States
New York
County Creation Dates
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| Name of County | Date Formed | Parent County | Progeny County |
| Albany | 01 Nov 1683 | Colonial lands | Tryon 1772, Charlotte 1772, Greene 1800, Columbia 1786, Rensselaer 1791, Saratoga 1791, Schoharie 1795, Schenectady 1809 |
| Allegany | 07 Apr 1806 | Genesee, Steuben (1808) | Genesee 1811, Wyoming 1846, Tioga 1822 |
| Berkshire | 28 May 1760 | disputed area | in State of Massachusetts |
| Bronx | 1914 | New York, Westchester | none |
| Broome | 28 Mar 1806 | Tioga | Tioga 1822 |
| Cattaraugus | 11 Mar 1808 | Genesee | none |
| Cayuga | 08 Mar 1799 | Onondaga | Seneca 1804, Tompkins 1817 |
| Charlotte | 12 Mar 1722 | Albany | renamed Washington 1784 |
| Chautauqua | 11 Mar 1808 | Genesee | none |
| Chemung | 29 Mar 1836 | Tioga | Schuyler 1854 |
| Chenango | 15 Mar 1798 | Herkimer, Tioga | Oneida 1804, Madison 1806 |
| Clinton | 07 Mar 1788 | Washington | St. Lawrence 1802, Oneida 1801, Essex 1799, Franklin 1808 |
| Columbia | 04 Apr 1786 | Albany | none |
| Cortland | 08 Apr 1808 | Onondaga | none |
| Cumberland | 1766 | Albany | now in State of Vermont as one of originals |
| Delaware | 10 Mar 1797 | Ulster, Otsego | none |
| Dukes | 01 Nov 1688 | Colonial lands (dispute) | in State of Massachusetts |
| Dutchess | 01 Nov 1683 | Colonial lands | Albany 1717, Putnam 1812 |
| Erie | 02 Apr 1821 | Niagara | Franklin 1808 |
| Essex | 01 Mar 1799 | Clinton, Franklin | none |
| Franklin | 11 Mar 1808 | Clinton | Essex 1822 |
| Fulton | 18 Apr 1838 | Montgomery | none |
| Genesee | 30 Mar 1802 | Ontario | Allegany 1806, Cattaraugus 1808, Chautauqua 1808, Niagara 1808, Livingston 1821, Monroe 1821, Orleans 1824, Wyoming 1841 |
| Greene | 30 Mar 1802 | Ontario | see note |
| Hamilton | 21 Feb 1816 | Montgomery | none |
| Herkimer | 16 Feb 1719 | Montgomery, Otsego | Onondaga 1794, Oneida 1798, Chenango 1798 |
| Jefferson | 28 Mar 1805 | Oneida | see note |
| Kings (Brooklyn) | 01 Nov 1683 | Colonial lands | none |
| Lewis | 28 Mar 1805 | Oneida, Jefferson | see note |
| Livingston | 23 Feb 1821 | Genesee, Ontario | see note |
| Madison | 21 Mar 1806 | Chenango, Oneida (1836) | none |
| Monroe | 23 Feb 1821 | Genesee, Ontario | none |
| Montgomery | 12 Mar 1772 | renamed from Tryon | Ontario 1789, Herkimer 1791, Otsego 1791, Tioga 1791, Hamilton 1816 |
| Nassau | 1899 | Queens | none |
| New York (Manhattan) | 1652 | Colonial lands | none |
| Niagara | 11 Mar 1808 | Genesee | Erie 1821 |
| Oneida | 15 Mar 1798 | Herkimer | Oswego 1816, Lewis 1805, Jefferson 1805, Clinton 1801, Madison 1836, Chenango 1804 |
| Onondaga | 05 Mar 1794 | Herkimer | Oswego 1816, Cayuga 1799, Cortland 1808 |
| Ontario | 27 Jan 1789 | Montgomery, Montgomery (1791), Steuben (1814) | Monroe 1821, Livingston 1821, Wayne 1823, Steuben 1796, Genesee 1802, Yates 1823 |
| Orange | 01 Nov 1683 | Colonial lands, Ulster (1798) | Rockland 1798 |
| Orleans | 11 Nov 1824 | Genesee, Genesee (1825) | none |
| Oswego | 01 Mar 1816 | Oneida, Onondaga | none |
| Otsego | 16 Feb 1791 | Montgomery | Schoharie 1795, Delaware 1797 |
| Putnam | 12 Jun 1812 | Dutchess | none |
| Queens | 01 Nov 1683 | Colonial lands | Nassau 1899 |
| Rensselaer | 07 Feb 1791 | Albany | none |
| Richmond (Staten Island) | 01 Nov 1683 | Colonial lands | none |
| Rockland | 23 Feb 1798 | Orange | none |
| St. Lawrence | 03 Mar 1805 | Clinton, Herkimer, Montgomery | none |
| Saratoga | 07 Feb 1791 | Albany | none |
| Schenectady | 07 Mar 1809 | Albany | none |
| Schoharie | 06 Apr 1795 | Albany, Otsego | Greene 1836 |
| Schuyler | 17 Apr 1854 | Chemung, Steuben, Tompkins | none |
| Seneca | 29 Mar 1804 | Cayuga | Tompkins 1817, Wayne 1823 |
| Steuben | 18 Mar 1796 | Ontario | Ontario 1814, Livingston 1822, Allegany 1808, Yates 1824 |
| Suffolk | 01 Nov 1683 | Colonial lands | none |
| Sullivan | 27 Mar 1809 | Ulster | none |
| Tioga | 16 Feb 1791 | Montgomery | Chenango 1798, Broome 1806, Chemung 1836, Tompkins 1822 |
| Tompkins | 17 Apr 1817 | Cayuga, Seneca | Tioga 1822, Schuyler 1854 |
| Tryon | 12 Mar 1772 | Albany | renamed Montgomery 1784 |
| Ulster | 01 Nov 1683 | Colonial lands | Delaware 1797, Greene 1800, Orange 1798, Sullivan 1809 |
| Warren | 12 Mar 1813 | Washington | none |
| Washington | 02 Apr 1784 | renamed from Charlotte | Clinton 1788 |
| Wayne | 11 Apr 1823 | Ontario, Seneca | none |
| Westchester | 01 Nov 1683 | Colonial Lands | Bronx |
| Wyoming | 14 May 1841 | Genesee, Allegany (1846) | none |
| Yates | 05 Feb 1823 | Ontario | none |

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