List of counties in New York
Learn more about List of counties in New York
 List of New York counties
|State Abbr.||FIPS State Code||State|
|FIPS County Code||County||Formed||County seat||Named after|
|001||Albany||November 1, 1683 as one of the original 12 counties||Albany||the Duke of York and Albany.|
|003||Allegany||April 7, 1806 from part of Genesee County||Belmont||the Allegheny River.|
|005||Bronx||April 19, 1912 from part of New York County that originally was in Westchester County||Coextensive with The Bronx in New York City||Jonas Bronck|
|007||Broome||March 28, 1806 from part of Tioga County||Binghamton||John Broome.|
|009||Cattaraugus||March 11, 1808 from part of Genesee County||Little Valley||a Seneca phrase meaning "bad smelling banks" (referring to the odor of natural gas which leaked from local rock formations).|
|011||Cayuga||March 8, 1799 from part of Onondaga County||Auburn||the Cayuga tribe|
|013||Chautauqua||March 11, 1808 from part of Genesee County||Mayville||a Seneca word meaning "where the fish was taken out."|
|015||Chemung||March 29, 1836 from part of Tioga County||Elmira||a Lenape word meaning "big horn", which was the name of a local Indian village|
|017||Chenango||March 15, 1798 from parts of Tioga County and Herkimer County||Norwich||an Onondaga word meaning "large bull-thistle"|
|019||Clinton||1788 from part of Washington County||Plattsburgh||George Clinton|
|021||Columbia||1786 from part of Albany County||Hudson||Christopher Columbus|
|023||Cortland||1808 from part of Onondaga County||Cortland||Pierre Van Cortlandt|
|025||Delaware||1797 from parts of Otsego County and Ulster County||Delhi||Thomas West, Lord De La Warr|
|027||Dutchess||1683 as one of the original 12 counties||Poughkeepsie||Lady Anne Hyde, the Duchess of York|
|029||Erie||1821 from part of Niagara County||Buffalo||the Erie tribe.|
|031||Essex||1799 from part of Clinton County||Elizabethtown||the county of Essex in England.|
|033||Franklin||1808 from part of Clinton County||Malone||Benjamin Franklin.|
|035||Fulton||1838 from part of Montgomery County||Johnstown||Robert Fulton.|
|037||Genesee||1802 from part of Ontario County||Batavia||a Seneca phrase meaning "good valley".|
|039||Greene||1800 from parts of Albany County and Ulster County||Catskill||Nathanael Greene.|
|041||Hamilton||1816 from part of Montgomery County||Lake Pleasant||Alexander Hamilton.|
|043||Herkimer||1791 from part of Montgomery County||Herkimer||Nicholas Herkimer.|
|045||Jefferson||1805 from part of Oneida County||Watertown||Thomas Jefferson.|
|047||Kings||1683 as one of the original 12 counties||Coextensive with Brooklyn in New York City.||King Charles II of England.|
|049||Lewis||1805 from part of Oneida County||Lowville||Morgan Lewis.|
|051||Livingston||1821 from parts of Genesee County and Ontario County||Geneseo||Robert R. Livingston|
|053||Madison||1806 from part of Chenango County||Wampsville||James Madison|
|055||Monroe||1821 from parts of Genesee and Ontario counties||Rochester||James Monroe|
|057||Montgomery||1772 from part of Albany County||Fonda.||Originally Tryon County. Renamed after Richard Montgomery in 1784|
|059||Nassau||1899 from Queens County||Mineola||William of Nassau|
|061||New York||1683 as one of the original 12 counties||Coextensive with Manhattan in New York City||the Duke of York and Albany|
|063||Niagara||1808 from part of Genesee County||Lockport||an Indian word meaning "thunder of waters"|
|065||Oneida||1798 from part of Herkimer County||Utica||the Oneida tribe|
|067||Onondaga||1792 from part of Herkimer County||Syracuse||the Onondaga tribe|
|069||Ontario||1789 from part of Montgomery County||Canandaigua||an Iroquois word meaning "beautiful lake"|
|071||Orange||1683 as one of the original 12 counties||Goshen||William of Orange|
|073||Orleans||1824 from part of Genesee County||Albion||the French Royal House of Orleans|
|075||Oswego||1816 from parts of Oneida and Onondaga counties||Pulaski|
|077||Otsego||1791 from part of Montgomery County||Cooperstown||Native American name for Otsego Lake|
|079||Putnam||1812 from part of Dutchess County||Carmel||Israel Putnam.|
|081||Queens||1683 as one of the original 12 counties||Jamaica. Coextensive with Queens in New York City||Queen Catherine of Braganza|
|083||Rensselaer||1791 from part of Albany County||Troy||Killiaen Van Rensselaer|
|085||Richmond||1683 as one of the original 12 counties||St. George. Coextensive with Staten Island in New York City.||the title of the illegitimate son of King Charles II of England.|
|087||Rockland||1798 from part of Orange County||New City.||early settlers' description of terrain as "rocky land".|
|091||Saratoga||1791 from part of Albany County||Ballston Spa.||corrupted Native American word meaning "the hill beside the river".|
|093||Schenectady||1809 from part of Albany County||Schenectady||Mohawk phrase meaning "on the other side of the pine lands".|
|095||Schoharie||1795 from parts of Albany County and Otsego County||Schoharie.|
|097||Schuyler||1795 from parts of Chemung County, Steuben County, and Tompkins County||Watkins Glen||Philip Schuyler.|
|099||Seneca||1804 from part of Cayuga County.||County seats: Ovid and Waterloo||the Seneca tribe|
|089||St. Lawrence||1802 from parts of Clinton County, Herkimer County, and Montgomery County||Canton||named after the river that forms the northern boarder of the county and New York State|
|101||Steuben||1796 from part of Ontario County||Bath||Friedrich von Steuben.|
|103||Suffolk||1683 as one of the original 12 counties||Riverhead|
|105||Sullivan||1809 from part of Ulster County||Monticello||John Sullivan|
|107||Tioga||1791 from part of Montgomery County||Owego||an Indian word meaning "at the forks," describing a meeting place|
|109||Tompkins||1817 from parts of Cayuga County and Seneca County||Ithaca||Daniel D. Tompkins|
|111||Ulster||1683 as one of the original 12 counties||Kingston|
|113||Warren||1813 from part of Washington County||Lake George||General Joseph Warren|
|115||Washington||1772 from part of Albany County||Hudson Falls.||originally Charlotte County; renamed after George Washington in 1784|
|117||Wayne||1823 from parts of Ontario County and Seneca County||Lyons||General Anthony Wayne.|
|119||Westchester||1683 as one of the original 12 counties||White Plains|
|121||Wyoming||1841 from part of Genesee County||Warsaw.|
|123||Yates||1823 from parts of Ontario and Steuben counties||Penn Yan||Governor Joseph C. Yates.|
 County Summary
The largest county in New York based on area is St. Lawrence County, and the smallest is New York County. The largest county based on population is Kings County, and the smallest is Hamilton County. The county with the largest population density is New York County (52,419 people/square mile), and the county with the smallest population density is Hamilton County (3 people/square mile).
The easternmost county is Suffolk County and the westernmost is Chautauqua County. The northernmost county is St. Lawrence County and the southernmost is Richmond County. The newest county is Bronx County (formed in 1914).
 Defunct counties
- Charlotte County: formed from 11,170 Square Miles of land from Albany County on March 12, 1772, but renamed and partitioned. See Washington County, New York.
- Cornwall County: Created on September 5, 1665 from 25,100 Square Miles of un-organized land to cover the Duke of York's land grant in present day Maine. On October 7, 1673, 24,900 Square Miles were lost to Devonshire, Massachusetts because of a boundary dispute. The remainder of the land was lost in the Autumn of 1675 to the Abnaki indians as a result of a war. The original grant was recreated on November 1, 1683, for the same reasons. The entire grant was transferred to Massachusetts because of the expansion of the Dominion of New England in the Spring of 1687. The entire grant covers what today are Aroostook, Piscataquis, Penobscot, Hancock, Washington, Waldo, Knox, Lincoln, Kennebec, and Somerset counties.
- Cumberland County: formed on July 3, 1766 from 1,910 Square Miles of Albany County land. Cumberland was disestablished on June 26, 1767, with the land returned to Albany County. Cumberland County was reinstated on March 19, 1768, this time with 2,050 Square Miles of land from Albany County. An additional 210 Square Miles of land - this time from partitioned from Albany and Charlotte Counties, with some of it passed on to Gloucester County. On April 1, 1775, 10 Square Miles of land was exchanged between Cumberland, Albany and Charlotte counties. On January 15, 1777, Cumberland County was extinguished due to the partitioning of Vermont from New York and New Hampshire. The Cumberland lands produced Windham, Bennington, Rutland, Windsor, and parts of Addison and Orange counties in Vermont. On March 7, 1788, New York attempted to adjust the border between itself and Vermont at the location where Cumberland County had previously existed, but to no effect.
- Dukes County: formed on November 1, 1683 as one of the original 12 counties. Created to cover the 1674 grant of the Martha's Vinyard, Elizabeth Islands, and Nantucket islands to the Duke of York. Transferred to Massachusetts on October 7, 1691, where it was divided into Dukes County, Massachusetts, which consists of Martha's Vinyard and the Elizabeth Islands, and Nantucket County, Massachusetts.
- Gloucester County: formed on March 16, 1770 from 1,540 Square Miles of land from Albany County. 3,390 Square Miles of additional land was transferred from Cumberland County, with some of the original transfer returned to Charlotte on March 24, 1772. Gloucester County, New York became all or most of Orange, Essex, Caledonia, Orleans, Lamoile and Washington Counties in Vermont on January 15, 1777.
- Tryon County: formed on March 12,1772 from indefinite amounts of land to the west of Albany County and renamed Montgomery County on April 2, 1784. On January 27, 1789, a western border was established as a result of the partitioning of the counto to create Ontario County. This resulted in Montgomery County having a total of 21,400 Square Miles within its borders. On February 16, 1892, Montgomery County was again partitioned, this time to create Herkimer, Otsego and Tioga counties. This reduced Montgomery to 1,080 Square Miles of land. As a result of an adjustment to the Montgomery-Herkimer border due to improved cartography, 3,730 Square miles of land passed from Herkimer to Montgomery, resulting in Montgomery having a total of 4,810 Square Miles of land on March 31, 1797. On April 3, 1801, Montgomery was partitioned again, this time with 1,870 Square Miles of land passing to Clinton, Essex, Saratoga, and Washington Counties, resulting in Montgomery only having 2,940 Square Miles of land. On April 12, 1816, Montgomery was again partitioned for the creation of Hamilton County, producing a Montgomery County of only 1,110 Square Miles of land. However, since Hamilton County was not properly organized, it remained a dependency of Montgomery County. On May 2, 1817, Montgomery County was again partitioned, this time passing 150 Square Miles of land to Herkimer County. On January 1, 1838, Hamilton County was finally organized sufficient to govern itself, and so it was detached from Montgomery. The final partition of Montgomery County took place on April 18, 1838, with 560 Square Miles of land going for the creation of Fulton County. This resulted in a Montgomery County of 400 Square Miles of land.
- Yorkshire County: original English county, partitioned in 1683 into Kings, Queens (including modern Nassau), Suffolk, Richmond and Westchester (including modern Bronx) counties.
 Proposed new counties
- Adirondack County: to be formed out of part of Essex and Franklin Counties.
- Peconic County: to be formed out of part of Suffolk County.
|Lists of Counties in the United States|
(Parishes in Louisiana; Boroughs and census areas in Alaska)
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 See also
- List of places in New York
- List of villages in New York
- List of cities in New York
- List of extinct U.S. counties