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New York Genealogy By County:

CountyDate FormedParent CountyCounty Seat
Albany 1683 original county Albany
Allegany 1806 Genesee Belmont
Bronx 1914 New York Bronx
Broome 1806 Tioga Binghamton
Cattaraugus 1808 Genesee Little Valley
Cayuga 1799 Onondaga Auburn
Charlotte 1772 Albany renamed Washington in 1784
Chautauqua 1808 Genesee Mayville
Chemung 1836 Tioga Elmira
Chenango 1798 Herkimer, Tioga Norwich
Clinton 1788 Washington Plattsburgh
Columbia 1786 Albany Hudson
Cortland 1808 Onondaga Cortland
Delaware 1797 Ulster, Otsego Delhi
Dutchess 1683 original county Poughkeepsie
Erie 1821 Niagara Buffalo
Essex 1799 Clinton Elizabethtown
Franklin 1808 Clinton Malone
Fulton 1838 Montgomery Johnstown
Genesee 1802 Ontario Batavia
Greene 1800 Ulster, Albany Catskill
Hamilton 1816 Montgomery Lake Pleasant
Herkimer1791MontgomeryHerkimer
Jefferson 1805 Oneida Watertown
Kings (Brooklyn) 1683 Original county Brooklyn
Lewis 1805 Oneida Lowville
Livingston 1821 Genesee, Ontario Geneseo
Madison 1806 Chenango Wampsville
Monroe 1821 Genesee, Ontario Rochester
Montgomery1772Albany (as Tryon to 1784)Fonda
Nassau 1899 Queens Mineola
New York City (Manhattan) 1683 Original county New York
Niagara 1808 Genesee Lockport
Oneida 1798 Herkimer Utica
Onondaga 1794 Herkimer Syracuse
Ontario 1789 Montgomery Canandaigua
Orange 1683 Original county Goshen
Orleans 1824 Genesee Albion
Oswego 1816 Oneida, Onondaga Oswego, Pulaski
Otsego 1791 Montgomery Cooperstown
Putnam 1812 Dutchess Carmel
Queens 1683 Original county Jamaica
Rensselaer 1791 Albany Troy
Richmond (Staten Island) 1683 Original county St. George
Rockland 1798 Orange New City
St. Lawrence 1802 Clinton, Herkimer, Montgomery Canton
Saratoga 1791 Albany Ballston Spa
Schenectady 1809 Albany Schenectady
Schoharie 1795 Albany, Ostego Schoharie
Schuyler 1854 Tompkins, Steuben, Chemung Watkins Glen
Seneca 1804 Cayuga Ovid, Waterloo
Steuben 1796 Ontario Bath
Suffolk 1683 Original county Riverhead
Sullivan 1809 Ulster Monticello
Tioga 1791 Montgomery Owego
Tompkins 1817 Cayuga, Seneca Ithaca
Tryon1772 Albany (renamed Montgomery 1784)
Ulster 1683 Original county Kingston
Warren 1813 Washington Lake George
Washington1772 Albany (see Charlotte) Hudson Falls
Wayne 1823 Ontario, Seneca Lyons
Westchester 1683 Original county White Plains
Wyoming 1841 Genesee Warsaw
Yates 1823 Ontario, Steuben Penn Yan


List of Obsolete New York New York Counties


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