New York County Creation Dates and Parent CountiesEdit This Page

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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 1818 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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