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Genealogy of New York State Counties

Compiled by Sylvia Hasenkopf


 The original counties:

Ulster  formed in 1683
Albany formed in 1683
Dutchess formed in 1683
Orange formed in 1683
New York formed in 1683
Kings formed in1683
Suffolk formed in 1683
Queens formed in 1683
Westchester formed in 1683
Richmond formed in 1683 

Columbia formed from Albany in 1736
Washington formed from Washington in 1772
Montgomery formed from Albany in 1772
Clinton formed from Washington in 1788
Ontario formed from Montgomery in 1789
Steuben formed from Ontario in 1789
Saratoga formed from Albany in 1791
Rensselaer formed from Albany in 1791
Tioga formed from Montgomery in 1791
Otsego formed from Montgomery in 1791
Herkimer formed from Montgomery in 1791
Onondaga was formed from Herkimer and Tioga in 1794
Schoharie formed from Albany and Otsego in 1795
Delaware formed from Ulster and Otsego in 1797
Rockland formed from Orange in 1798
Oneida was formed from Herkimer in 1798
Chenango was formed from Tioga and Herkimer in 1798
Essex was formed from Clinton in 1799
Cayuga was formed from Onondaga in 1799
Greene formed from Ulster and Albany in 1800
Genesee formed from Ontario in 1802
St Lawrence was formed from Herkimer and Clinton in 1802
Seneca was formed from Cayuga in 1804
Lewis was formed from Oneida in 1805
Jefferson was formed from Oneida in 1805
Allegany formed from Genesee in 1806
Madison was formed from Chenango in 1806
Broome was formed from Tioga in 1806
Cortland was formed from Onondaga in 1808
Niagara formed from Genesee in 1808
Franklin was formed from Clinton in 1808
Cattaraugus was formed from Genesee in 1808
Chautauqua was formed from Genesee in 1808
Sullivan formed from Ulster in 1809
Schenectady formed from Albany in 1809
Putnam formed from Dutchess in 1812
Warren formed from Washington in 1813
Hamilton formed from Montgomery in 1816
Oswego was formed from Oneida and Onondaga in 1816
Tompkins was formed from Seneca and Cayuga in 1817
Erie formed from Niagara in 1821
Livingston was formed from Genesee and Ontario in 1821
Monroe was formed from Genesee and Ontario in 1821
Yates formed from Ontario in 1823
Wayne was formed from Ontario and Seneca in 1823
Orleans was formed from Genesee in 1824
Chemung was formed from Tioga in 1836
Fulton formed from Montgomery in 1838
Wyoming formed from Genesee in 1841
Schuyler was formed from Chemung, Steuben and Tompkins in 1854
Nassau formed from Queens in 1899
Bronx formed from New York in 1914


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