New York County Creation Dates and Parent Counties
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New York County Creation Dates
Clickable Map - scroll below the list.
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See an interactive outline map of New York Historical Counties at Newberry Library site[1] (Free) Enter a year, Refresh Map, select zoom in, then click on the map to enlarge it. |
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Sort the table by Date Formed or by Parent Counties and check Boundary Changes for interesting insights. |
New York (Manhattan)
| Name of County | Date Formed | Boundary Changes |
Parent County | Counties Created by Boundary Changes |
| Albany | 1683 Nov 01 | Details | Colonial lands | Tryon 1772, Charlotte 1772, Greene 1800, Columbia 1786, Rensselaer 1791, Saratoga 1791, Schoharie 1795, Schenectady 1809 |
| Allegany | 1806 Apr 07 | Details | Genesee, Steuben (1808) | Genesee 1811, Wyoming 1846, Tioga 1822 |
| Berkshire | 1760 May 28 | Details | disputed area | in State of Massachusetts |
| Bronx | 1914 4 19 | Details | New York, Westchester | none |
| Broome | 1806 Mar 28 | Details | Tioga | Tioga 1822 |
| Cattaraugus | 1808 Mar 11 | Details | Genesee | none |
| Cayuga | 1799 Mar 08 | Details | Onondaga | Seneca 1804, Tompkins 1817 |
| Charlotte | 1722 Mar 12 | Details | Albany | renamed Washington 1784 |
| Chautauqua | 1808 Mar 11 | Details | Genesee | none |
| Chemung | 1836 Mar 29 | Details | Tioga | Schuyler 1854 |
| Chenango | 1798 Mar 15 | Details | Herkimer, Tioga | Oneida 1804, Madison 1806 |
| Clinton | 1788 Mar 07 | Details | Washington | St. Lawrence 1802, Oneida 1801, Essex 1799, Franklin 1808 |
| Columbia | 1786 Apr 04 | Details | Albany | none |
| Cortland | 1808 Apr 08 | Details | Onondaga | none |
| Cumberland | 1766 6 17 | Details | Albany | now in State of Vermont as one of originals |
| Delaware | 1797 Mar 10 | Details | Ulster, Otsego | none |
| Dukes | 1688 Nov 01 | Details | Colonial lands (dispute) | in State of Massachusetts |
| Dutchess | 1683 Nov 01 | Details | Colonial lands | Albany 1717, Putnam 1812 |
| Erie | 1821 Apr 02 | Details | Niagara | Franklin 1808 |
| Essex | 1799 Mar 01 | Details | Clinton, Franklin | none |
| Franklin | 1808 Mar 11 | Details | Clinton | Essex 1822 |
| Fulton | 1838 Apr 18 | Details | Montgomery | none |
| Genesee | 1802 Mar 30 | Details | Ontario | Allegany 1806, Cattaraugus 1808, Chautauqua 1808, Niagara 1808, Livingston 1821, Monroe 1821, Orleans 1824, Wyoming 1841 |
| Greene | 1802 Mar 30 | Details | Ontario | see note |
| Hamilton | 1816 Feb 21 | Details | Montgomery | none |
| Herkimer | 1719 Feb 16 | Details | Montgomery, Otsego | Onondaga 1794, Oneida 1798, Chenango 1798 |
| Jefferson | 1805 Mar 28 | Details | Oneida | see note |
| Kings (Brooklyn) | 1683 Nov 01 | Details | Colonial lands | none |
| Lewis | 1805 Mar 28 | Details | Oneida, Jefferson | see note |
| Livingston | 1821 Feb 23 | Details | Genesee, Ontario | see note |
| Madison | 1806 Mar 21 | Details | Chenango, Oneida (1836) | none |
| Monroe | 1821 Feb 23 | Details | Genesee, Ontario | none |
| Montgomery | 1772 Mar 12 | Details | renamed from Tryon | Ontario 1789, Herkimer 1791, Otsego 1791, Tioga 1791, Hamilton 1816 |
| Nassau | 1899 9 18 | Details | Queens | none |
| 1652 2 16 | Details | Colonial lands | none | |
| Niagara | 1808 Mar 11 | Details | Genesee | Erie 1821 |
| Oneida | 1798 Mar 15 | Details | Herkimer | Oswego 1816, Lewis 1805, Jefferson 1805, Clinton 1801, Madison 1836, Chenango 1804 |
| Onondaga | 1794 Mar 05 | Details | Herkimer | Oswego 1816, Cayuga 1799, Cortland 1808 |
| Ontario | 1789 Jan 27 | Details | Montgomery, Montgomery (1791), Steuben (1814) | Monroe 1821, Livingston 1821, Wayne 1823, Steuben 1796, Genesee 1802, Yates 1823 |
| Orange | 1683 Nov 01 | Details | Colonial lands, Ulster (1798) | Rockland 1798 |
| Orleans | 1824 Nov 11 | Details | Genesee, Genesee (1825) | none |
| Oswego | 1816 Mar 01 | Details | Oneida, Onondaga | none |
| Otsego | 1791 Feb 16 | Details | Montgomery | Schoharie 1795, Delaware 1797 |
| Putnam | 1812 Jun 12 | Details | Dutchess | none |
| Queens | 1683 Nov 01 | Details | Colonial lands | Nassau 1899 |
| Rensselaer | 1791 Feb 07 | Details | Albany | none |
| Richmond (Staten Island) | 1683 Nov 01 | (STATEN ISLAND) Details | Colonial lands | none |
| Rockland | 1798 Feb 23 | Details | Orange | none |
| St. Lawrence | 1805 Mar 03 | Details | Clinton, Herkimer, Montgomery | none |
| Saratoga | 1791 Feb 07 | Details | Albany | none |
| Schenectady | 1809 Mar 07 | Details | Albany | none |
| Schoharie | 1795 Apr 06 | Details | Albany, Otsego | Greene 1836 |
| Schuyler | 1854 Apr 17 | Details | Chemung, Steuben, Tompkins | none |
| Seneca | 1804 Mar 29 | Details | Cayuga | Tompkins 1817, Wayne 1823 |
| Steuben | 1796 Mar 18 | Details | Ontario | Ontario 1814, Livingston 1822, Allegany 1808, Yates 1824 |
| Suffolk | 1683 Nov 01 | Details | Colonial lands | none |
| Sullivan | 1809 Mar 27 | Details | Ulster | none |
| Tioga | 1791 Feb 16 | Details | Montgomery | Chenango 1798, Broome 1806, Chemung 1836, Tompkins 1822 |
| Tompkins | 1817 Apr 17 | Details | Cayuga, Seneca | Tioga 1822, Schuyler 1854 |
| Tryon | 1772 Mar 12 | Details | Albany | renamed Montgomery 1784 |
| Ulster | 1683 Nov 01 | Details | Colonial lands | Delaware 1797, Greene 1800, Orange 1798, Sullivan 1809 |
| Warren | 1813 Mar 12 | Details | Washington | none |
| Washington | 1784 Apr 02 | Details | renamed from Charlotte | Clinton 1788 |
| Wayne | 1823 Apr 11 | Details | Ontario, Seneca | none |
| Westchester | 1683 Nov 01 | Details | Colonial Lands | Bronx |
| Wyoming | 1841 May 14 | Details | Genesee, Allegany (1846) | none |
| Yates | 1823 Feb 05 | Details | Ontario | none |
Clickable Map Click on the county in the map below to go to a county page.
References[edit | edit source]
- ↑ [http://historical-county.newberry.org/website/New_York/viewer.htm New_York Atlas of Historical County Boundaries, John H. Long, Editor; Peggy Tuck Sinko, Associate Editor; Gordon DenBoer, Historical Compiler; Douglas Knox, Book Digitizing Director and Digital Compiler; Emily Kelley, Research Associate; Laura Rico-Beck, GIS Specialist; Peter Siczewicz, ArcIMS Interactive Map Designer; Robert Will, Cartographic Assistant. Copyright The Newberry Library 2008.
