| County | FIPS | Created | Formed From | |
|---|---|---|---|---|
| Albany County | 001 | 1683 | One of 12 original counties created in the New York colony | |
| Allegany County | 003 | 1806 | Genesee County | |
| Bronx County | 005 | 1914[6] | New York County | |
| Broome County | 007 | 1806 | Tioga County | |
| Cattaraugus County | 009 | 1808 | Genesee County | |
| Cayuga County | 011 | 1799 | Onondaga County | |
| Chautauqua County | 013 | 1808 | Genesee County | |
| Chemung County | 015 | 1836 | Tioga County | |
| Chenango County | 017 | 1798 | Tioga County and Herkimer County | |
| Clinton County | 019 | 1788 | Washington County | |
| Columbia County | 021 | 1786 | Albany County | |
| Cortland County | 023 | 1808 | Onondaga County | |
| Delaware County | 025 | 1797 | Otsego County and Ulster County | |
| Dutchess County | 027 | 1683 | One of 12 original counties created in the New York colony | |
| Erie County | 029 | 1821 | Niagara County | |
| Essex County | 031 | 1799 | Clinton County | |
| Franklin County | 033 | 1808 | Clinton County | |
| Fulton County | 035 | 1838 | Montgomery County | |
| Genesee County | 037 | 1802 | Ontario County | |
| Greene County | 039 | 1800 | Albany County and Ulster County | |
| Hamilton County | 041 | 1816 | Montgomery County | |
| Herkimer County | 043 | 1791 | Montgomery County | |
| Jefferson County | 045 | 1805 | Oneida County | |
| Kings County | 047 | 1683 | One of 12 original counties created in the New York colony | |
| Lewis County | 049 | 1805 | Oneida County | |
| Livingston County | 051 | 1821 | Genesee County and Ontario County | |
| Madison County | 053 | 1806 | Chenango County | |
| Monroe County | 055 | 1821 | Genesee County and Ontario County | |
| Montgomery County | 057 | 1772 | Albany County | |
| Nassau County | 059 | 1899 | Queens County | |
| New York County | 061 | 1683 | One of 12 original counties created in the New York colony | |
| Niagara County | 063 | 1808 | Genesee County | |
| Oneida County | 065 | 1798 | Herkimer County | |
| Onondaga County | 067 | 1792 | Herkimer County | |
| Ontario County | 069 | 1789 | Montgomery County | |
| Orange County | 071 | 1683 | One of 12 original counties created in the New York colony | |
| Orleans County | 073 | 1824 | Genesee County | |
| Oswego County | 075 | 1816 | Oneida County and Onondaga County | |
| Otsego County | 077 | 1791 | Montgomery County | |
| Putnam County | 079 | 1812 | Dutchess County | |
| Queens County | 081 | 1683 | One of 12 original counties created in the New York colony | |
| Rensselaer County | 083 | 1791 | Albany County | |
| Richmond County | 085 | 1683 | One of 12 original counties created in the New York colony | |
| Rockland County | 087 | 1798 | Orange County | |
| Saratoga County | 091 | 1791 | Albany County | |
| Schenectady County | 093 | 1809 | Albany County | |
| Schoharie County | 095 | 1795 | Albany County and Otsego County | |
| Schuyler County | 097 | 1854 | Chemung County, Steuben County, and Tompkins County | |
| Seneca County | 099 | 1804 | Cayuga County | |
| St. Lawrence County | 089 | 1802 | Clinton County, Herkimer County, and Montgomery County | |
| Steuben County | 101 | 1796 | Ontario County | |
| Suffolk County | 103 | 1683 | One of 12 original counties created in the New York colony | |
| Sullivan County | 105 | 1809 | Ulster County | |
| Tioga County | 107 | 1791 | Montgomery County | |
| Tompkins County | 109 | 1817 | Cayuga County and Seneca County | |
| Ulster County | 111 | 1683 | One of 12 original counties created in the New York colony | |
| Warren County | 113 | 1813 | Washington County | |
| Washington County | 115 | 1772 | Albany County | |
| Wayne County | 117 | 1823 | Ontario County and Seneca County | |
| Westchester County | 119 | 1683 | One of 12 original counties created in the New York colony | |
| Wyoming County | 121 | 1841 | Genesee County | |
| Yates County | 123 | 1823 | Ontario County and Steuben County |