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| County | Date Formed | County Seat | Parent County | Named For | Coordinator | Map |
|---|---|---|---|---|---|---|
| Albany | 1683 | Albany | Original County | James II, Duke of Albany (among others) | Adopt me... |  |
| Allegany | 1806 | Belmont | Genesee | Variant of the spelling of Allegheny | Adopt Me.... |  |
| Bronx | 1914 | Bronx | New York | Jonas Bronck, an early settler of New Amsterdam | Jan Cortez |  |
| Broome | 1806 | Binghamton | Tioga | Lt John Broome, Fourth Lt Governor of New York | Jan Cortez |  |
| Cattaraugus | 1808 | Little Valley | Genesee | A Seneca word meaning "bad smelling banks" referring to the natural gas odors | Adopt Me.... |  |
| Cayuga | 1799 | Auburn | Onondaga | Cayuga Tribe | Adopt Me.... |  |
| Charlotte | 1772 | Became Washington in 1784 | Albany | Adopt Me.... | No Map Available | |
| Chautauqua | 1808 | Mayville | Genesee | Seneca word with unknown meaning | Jim Albro |  |
| Chemung | 1836 | Elmira | Tioga | A Lenape word meaning "big horn" | Adopt Me.... |  |
| Chenango | 1798 | Norwich | Herkimer & Tioga | Onondaga word meaning "large bull thistle" | Adopt Me.... |  |
| Clinton | 1788 | Plattsburgh | Washington | George Clinton, Fourth Vice-President of the US, First & Third Governor of New York | Adopt Me.... |  |
| Columbia | 1786 | Hudson | Albany | Christopher Columbus | Adopt Me.... |  |
| Cortland | 1808 | Cortland | Onondaga | Pierre VanCortlandt, First Lt Governor of New York | Adopt Me.... |  |
| Delaware | 1797 | Delhi | Ulster & Otsego | Thomas West, Third Baron De La Warr | Adopt Me.... |  |
| Dutchess | 1683 | Poughkeepsie | Original County | Lady Anne Hyde, Duchess of York | Adopt Me.... |  |
| Erie | 1821 | Buffalo | Niagara | Erie Tribe | Adopt Me..... |  |
| Essex | 1799 | Elizabethtown | Clinton | Essex County in England | Adopt Me..... |  |
| Franklin | 1808 | Malone | Clinton | Benjamin Franklin | Adopt Me.... |  |
| Fulton | 1838 | Johnstown | Montgomery | Robert Fulton, Inventor of the Steamship | Adopt Me.... |  |
| Genesee | 1802 | Batavia | Ontario | Seneca word meaning "good valley" | Adopt Me.... |  |
| Greene | 1800 | Catskill | Ulster & Albany | Nathanael Greene, Revolutionary War General | Adopt Me.... |  |
| Hamilton | 1816 | Lake Pleasant | Montgomery | Alexander Hamilton, First Secretary of the Treasury | Adopt Me.... |  |
| Herkimer | 1791 | Herkimer | Montgomery | Nicholas Herkimer, Revolutionary War General | Adopt Me.... |  |
| Jefferson | 1805 | Watertown | Oneida | Thomas Jefferson | Adopt Me.... |  |
| Kings (Brooklyn) | 1683 | Brooklyn | Original County | King Charles II of England | Jan Cortez |  |
| Lewis | 1805 | Lowville | Oneida | Morgan Lewis, Fourth Governor of New York | Adopt Me.... |  |
| Livingston | 1821 | Geneseo | Genesee & Ontario | Robert Livingston, New York delegate to the Continental Congress | Jeanne Hicks |  |
| Madison | 1806 | Wampsville | Chenango | James Madison, Fourth President of the US | Adopt Me.... |  |
| Monroe | 1821 | Rochester | Genesee & Ontario | James Monroe, Fifth President of the US | Adopt Me.... |  |
| Montgomery | 1772 | Fonda | Albany | Richard Montgomery, Revolutionary War General | Adopt Me.... |  |
| Nassau | 1899 | Mineola | Queens | William of Orange-Nassau, who became William III of England | Adopt Me.... |  |
| New York City (Manhattan) | 1683 | New York City | Original County | King James II, also Duke of York and Duke of Albany | Jan Cortez |  |
| Niagara | 1808 | Lockport | Genesee | Iroquoian word meaning "a neck" between two bodies of water, "thunder of waters", or "bisected bottom land" | Adopt Me.... |  |
| Oneida | 1798 | Utica | Herkimer | Oneida Tribe | Adopt Me.... |  |
| Onondaga | 1794 | Syracuse | Herkimer | Onondaga Tribe | Adopt Me.... |  |
| Ontario | 1789 | Canandaigua | Montgomery | Iroquoian word meaning "beautiful lake" | Adopt Me.... |  |
| Orange | 1683 | Goshen | Original | William of Orange-Nassau, who becme William II of England | Adopt Me.... |  |
| Orleans | 1824 | Albion | Genesee | French Royal House of Orleans | Adopt Me.... |  |
| Oswego | 1816 | Oswego | Oneida & Onondaga | Oswego River | Adopt Me.... |  |
| Otsego | 1791 | Cooperstown | Montgomery | A Native American word meaning "place of the rock" | Adopt Me.... |  |
| Putnam | 1812 | Carmel | Dutchess | Israel Putnam, Revolutionary War General | Adopt Me.... |  |
| Queens | 1683 | Jamaica | Original County | Catherine of Braganza, Queen of England | Jan Cortez |  |
| Rensselaer | 1791 | Troy | Albany | Kiliaen van Rensselaer, the early landholder in the Dutch New Amsterdam colony | Adopt Me.... |  |
| Richmond (Staten Island) | 1683 | St George | Original County | Charles Lennox, First Duke of Richmond | Jan Cortez |  |
| Rockland | 1798 | New City | Orange | Early description as "rocky land" | Adopt Me.... |  |
| St Lawrence | 1802 | Canton | Clinton, Herkimer & Montgomery | St Lawrence River | W David Samuelsen |  |
| Saratoga | 1791 | Ballston Spa | Albany | Corruption of a Native American word meaning "hill beside the river" | Adopt Me.... |  |
| Schenectady | 1809 | Schenectady | Albany | Mohawk word meaning "other side of the pine lands" | Adopt Me.... |  |
| Schoharie | 1795 | Schoharie | Albany & Otsego | Mohawk word meaning "floating driftwood" | Jan Cortez |  |
| Schuyler | 1854 | Watkins Glen | Tompkins, Steuben & Chemung | Philip Schuyler, Revolutionary War General | Adopt Me.... |  |
| Seneca | 1804 | Ovid/Waterloo | Cayuga | Seneca Tribe | Adopt Me.... |  |
| Steuben | 1796 | Bath | Ontario | Friedrich Wilhelm von Steuben, the Prussian general who assisted the Continental Army | Adopt Me.... |  |
| Suffolk | 1683 | Riverhead | Original County | Suffolk County in England | Adopt Me.... |  |
| Sullivan | 1809 | Monticello | Ulster | John Sullivan, Revolutionary War General | Adopt Me.... |  |
| Tioga | 1791 | Owego | Montgomery | Native American word meaning "at the fork" | Adopt Me.... |  |
| Tompkins | 1817 | Ithaca | Cayuga & Seneca | David D Tompkins, Sixth Vice President of the US | Adopt Me.... |  |
| Tryon | 1772 | Renamed Montgomery in 1784 | Albany | Adopt Me.... | No Map Available | |
| Ulster | 1683 | Kingston | Original County | Irish Province of Ulster | Adopt Me.... |  |
| Warren | 1813 | Lake George | Washington | Joseph Warren, Revolutionary War General | Adopt Me.... |  |
| Washington | 1772 | Hudson Falls | Albany | George Washington | Adopt Me.... |  |
| Wayne | 1823 | Lyons | Ontario & Seneca | Anthony Wayne, Revolutionary War General | Adopt Me.... |  |
| Westchester | 1683 | White Plains | Original County | City of Chester in England | Adopt Me.... |  |
| Wyoming | 1841 | Warsaw | Genesee | Adaptation of Lenape word meaning "broad bottom lands" | W David Samuelsen |  |
| Yates | 1823 | Penn Yan | Ontario & Steuben | Joseph C Gates, Eighth Governor of New York | Adopt Me.... |  |
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