Home | New York Genealogy | New York State County Formation Timeline
Try our genealogy search engine
New York State County Formation Timeline for genealogy, is a timeline showing the formation of New York State counties, including dates and counties formed from.
County | Formed From | Date | County Seat | Notes |
---|---|---|---|---|
Albany | Original County | 1683 | Albany | |
Allegany | Genesee | 1806 | Belmont | |
Bronx | New York | 1914 | Bronx | |
Broome | Tioga | 1806 | Binghamton | |
Cattaraugus | Genesee | 1808 | Genesee | |
Cayuga | Onondaga | 1799 | Auburn | |
Charlotte | Albany | 1772 | ||
Chautauqua | Genesee | 1808 | Mayville | Renamed Washington in 1784 |
Chemung | Tioga | 1836 | Elmira | |
Chenango | Herkimer and tioga | 1798 | Norwich | |
Clinton | Washington | 1788 | Plattsburg | |
Columbia | Albany | 1786 | Hudson | |
Cortland | Onondaga | 1808 | Cortland | |
Delaware | Ulster, Otsego | 1797 | Delhi | |
Dutchess | Original County | 1683 | Poughkeepsie | |
Erie | Niagara | 1821 | Buffalo | |
Essex | Clinton | 1799 | Elizabethtown | |
Franklin | Clinton | 1808 | Malone | |
Fulton | Montgomery | 1838 | Johnstown | |
Genesee | Ontario | 1802 | Batavia | |
Greene | Albany and Ulster | 1800 | Catskill | |
Hamilton | Montgomery | 1816 | Lake Pleasant | |
Herkimer | Montgomery | 1791 | Herkimer | |
Jefferson | Oneida | 1805 | Watertown | |
Kings | Original County | 1683 | Brooklyn | |
Lewis | Oneida | 1805 | ||
Livingston | Genesee, Ontario | 1821 | Geneseo | |
Madison | Chenango | 1806 | Wampsville | |
Monroe | Genesee, Ontario | 1821 | Rochester | |
Montgomery | Albany | 1772 | Fonda | |
Nassau | Queens | 1899 | Mineola | Until 1784 called Tryon |
New York | Original County | 1683 | New York City | |
Niagara | Genesee | 1808 | Lockport | |
Oneida | Herkimer | 1798 | Utica | |
Onondaga | Herkimer | 1794 | Syracuse | |
Ontario | Montgomery | 1789 | Canandaigua | |
Orange | Original County | 1683 | Goshen | |
Orleans | Genesee | 1824 | Albion | |
Oswego | Oneida, Onondaga | 1821 | Oswego | |
Otsego | Montgomery | 1791 | Cooperstown | |
Putnam | Dutchess | 1812 | Carmel | |
Queens | Original County | 1683 | Jamaica | |
Rensselaer | Albany | 1791 | Troy | |
Richmond | Original County | 1683 | St. George | |
Rockland | Orange | 1798 | New City | |
St. Lawrence | Clinton, Herkimer, Montgomery | 1802 | Canton | |
Saratoga | Albany | 1791 | Ballston Spa | |
Schenectady | Albany | 1809 | Schenectady | |
Schoharie | Albany and Otsego | 1795 | Schoharie | |
Schuyler | Tompkins, Steuben, Chemung | 1854 | Watkins Glen | |
Seneca | Cayuga | 1804 | Waterloo | |
Steuben | Ontario | 1796 | Bath | |
Suffolk | Original County | 1683 | Riverhead | |
Sullivan | Ulster | 1809 | Monticello | |
Tioga | Montgomery | 1791 | Owego | |
Tompkins | Cayuga, Seneca | 1817 | Ithaca | |
Tryon | Albany | 1772 | Renamed Montgomery in 1791 | |
Ulster | Original County | 1683 | Kingston | |
Warren | Washington | 1813 | Lake George | |
Washington | Albany | 1772 | Hudson Falls | |
Wayne | Ontario, Seneca | 1823 | Lyons | |
Westchester | Original County | 1683 | White Plains | |
Wyoming | Genesee | 1841 | Warsaw | |
Yates | Ontario, Steuben | 1823 | Penn Yan |
Home | New York Genealogy | New York State County Formation Timeline