Albany County	001	Albany	1683	One of 12 original counties created in the New York colony	James II of England (James VII of Scotland) (1633.1701), who was Duke of York (English title) and Duke of Albany (Scottish title) before becoming King of England, Ireland, and Scotland.	570.74	304,204	533 sq mi
(1,380 km2)	State map highlighting Albany County
Allegany County	003	Belmont	1806	Genesee County	A variant spelling of the Allegheny River	47.34	48,946	1,034 sq mi
(2,678 km2)	State map highlighting Allegany County
Bronx County	005	none	1914[6]	New York County	Jonas Bronck (1600?.1643), an early settler of the Dutch colony of New Amsterdam	24,118.20	1,385,108	57.43 sq mi
(149 km2)	State map highlighting Bronx County
Broome County	007	Binghamton	1806	Tioga County	John Broome (1738.1810), fourth Lieutenant Governor of New York	280.56	200,600	715 sq mi
(1,852 km2)	State map highlighting Broome County
Cattaraugus County	009	Little Valley	1808	Genesee County	A Seneca word meaning "bad smelling banks", referring to the odor of natural gas which leaked from local rock formations	61.31	80,317	1,310 sq mi
(3,393 km2)	State map highlighting Cattaraugus County
Cayuga County	011	Auburn	1799	Onondaga County	The Cayuga tribe of Native Americans	92.62	80,026	864 sq mi
(2,238 km2)	State map highlighting Cayuga County
Chautauqua County	013	Mayville	1808	Genesee County	Loanword from the Erie language describing Chautauqua Lake; language now lost and cannot be translated	89.94	134,905	1,500 sq mi
(3,885 km2)	State map highlighting Chautauqua County
Chemung County	015	Elmira	1836	Tioga County	A Lenape word meaning "big horn", which was the name of a local Native American village	216.23	88,830	410.81 sq mi
(1,064 km2)	State map highlighting Chemung County
Chenango County	017	Norwich	1798	Tioga County and Herkimer County	An Onondaga word meaning "large bull-thistle"	56.16	50,477	898.85 sq mi
(2,328 km2)	State map highlighting Chenango County
Clinton County	019	Plattsburgh	1788	Washington County	George Clinton (1739.1812), fourth Vice President of the United States and first and third Governor of New York	73.46	82,128	1,118 sq mi
(2,896 km2)	State map highlighting Clinton County
Columbia County	021	Hudson	1786	Albany County	Christopher Columbus (1451.1506), the European explorer	97.37	63,096	648 sq mi
(1,678 km2)	State map highlighting Columbia County
Cortland County	023	Cortland	1808	Onondaga County	Pierre Van Cortlandt (1721.1814), first Lieutenant Governor of New York	98.28	49,336	502 sq mi
(1,300 km2)	State map highlighting Cortland County
Delaware County	025	Delhi	1797	Otsego County and Ulster County	Thomas West, 3rd Baron De La Warr (1577.1618), an early colonial leader in Virginia	32.68	47,980	1,468 sq mi
(3,802 km2)	State map highlighting Delaware County
Dutchess County	027	Poughkeepsie	1683	One of 12 original counties created in the New York colony	Lady Anne Hyde (1637.1671), Duchess of York and wife of King James II of England	360.59	297,488	825 sq mi
(2,137 km2)	State map highlighting Dutchess County
Erie County	029	Buffalo	1821	Niagara County	The Erie tribe of Native Americans	749.02	919,040	1,227 sq mi
(3,178 km2)	State map highlighting Erie County
Essex County	031	Elizabethtown	1799	Clinton County	The county of Essex in England	20.55	39,370	1,916 sq mi
(4,962 km2)	State map highlighting Essex County
Franklin County	033	Malone	1808	Clinton County	Benjamin Franklin (1706.1790), the early American printer, scientist, and statesman	30.41	51,599	1,697 sq mi
(4,395 km2)	State map highlighting Franklin County
Fulton County	035	Johnstown	1838	Montgomery County	Robert Fulton (1765.1815), inventor of the steamship	104.19	55,531	533 sq mi
(1,380 km2)	State map highlighting Fulton County
Genesee County	037	Batavia	1802	Ontario County and land acquired in the Holland Purchase	A Seneca phrase meaning "good valley"	121.37	60,079	495 sq mi
(1,282 km2)	State map highlighting Genesee County
Greene County	039	Catskill	1800	Albany County and Ulster County	Nathanael Greene (1742.1786), the American Revolutionary War general	74.80	49,221	658 sq mi
(1,704 km2)	State map highlighting Greene County
Hamilton County	041	Lake Pleasant	1816	Montgomery County	Alexander Hamilton (1755.1804), the early American political theorist and first Secretary of the Treasury	2.67	4,836	1,808 sq mi
(4,683 km2)	State map highlighting Hamilton County
Herkimer County	043	Herkimer	1791	Montgomery County	Nicholas Herkimer (1728.1777), the American Revolutionary War general	44.25	64,519	1,458 sq mi
(3,776 km2)	State map highlighting Herkimer County
Jefferson County	045	Watertown	1805	Oneida County	Thomas Jefferson (1743.1826), the early American statesman, author of the Declaration of Independence, and third President of the United States	62.59	116,229	1,857 sq mi
(4,810 km2)	State map highlighting Jefferson County
Kings County	047	none	1683	One of 12 original counties created in the New York colony	King Charles II of England (1630.1685)	25,848.30	2,504,700	96.9 sq mi
(251 km2)	State map highlighting Kings County
Lewis County	049	Lowville	1805	Oneida County	Morgan Lewis (1754.1844), the fourth Governor of New York	21.00	27,087	1,290 sq mi
(3,341 km2)	State map highlighting Lewis County
Livingston County	051	Geneseo	1821	Genesee County and Ontario County	Robert Livingston (1746.1813), the early American statesman and New York delegate to the Continental Congress	102.18	65,393	640 sq mi
(1,658 km2)	State map highlighting Livingston County
Madison County	053	Wampsville	1806	Chenango County	James Madison (1751.1836), the early American statesman, principal author of the Constitution of the United States, and fourth President of the United States	110.94	73,442	662 sq mi
(1,715 km2)	State map highlighting Madison County
Monroe County	055	Rochester	1821	Genesee County and Ontario County	James Monroe (1758.1831), the early American statesman and fifth President of the United States	544.91	744,344	1,366 sq mi
(3,538 km2)	State map highlighting Monroe County
Montgomery County	057	Fonda	1772	Albany County	Originally Tryon County after colonial governor William Tryon (1729.1788), renamed after the American Revolutionary War general Richard Montgomery (1738.1775) in 1784	122.49	50,219	410 sq mi
(1,062 km2)	State map highlighting Montgomery County
Nassau County	059	Mineola	1899	Queens County	The Princes of Orange-Nassau ruled the Netherlands when Long Island was a Dutch colony	2,957.02	1,339,532	453 sq mi
(1,173 km2)	State map highlighting Nassau County
New York County	061	none	1683	One of 12 original counties created in the New York colony	King James II of England (1633.1701), who was Duke of York and Albany before he ascended the throne of England, Duke of York being his English title	46,961.00	1,585,873	33.77 sq mi
(87 km2)	State map highlighting New York County
Niagara County	063	Lockport	1808	Genesee County	An Iroquoian word perhaps meaning "a neck" between two bodies of water, "thunder of waters", or "bisected bottom land"	189.89	216,469	1,140 sq mi
(2,953 km2)	State map highlighting Niagara County
Oneida County	065	Utica	1798	Herkimer County	The Oneida tribe of Native Americans	193.63	234,878	1,213 sq mi
(3,142 km2)	State map highlighting Oneida County
Onondaga County	067	Syracuse	1792	Herkimer County	The Onondaga tribe of Native Americans	579.44	467,026	806 sq mi
(2,088 km2)	State map highlighting Onondaga County
Ontario County	069	Canandaigua	1789	Land acquired in the Phelps and Gorham Purchase	An Iroquoian word meaning "beautiful lake"	163.04	107,931	662 sq mi
(1,715 km2)	State map highlighting Ontario County
Orange County	071	Goshen	1683	One of 12 original counties created in the New York colony	William of Orange-Nassau (1650.1702), who became King William III of England	444.35	372,813	839 sq mi
(2,173 km2)	State map highlighting Orange County
Orleans County	073	Albion	1824	Genesee County	The French Royal House of Orlés	52.49	42,883	817 sq mi
(2,116 km2)	State map highlighting Orleans County
Oswego County	075	Oswego	1816	Oneida County and Onondaga County	The Oswego River, from an Iroquoian word meaning "the outpouring", referring to the mouth of the river	93.07	122,109	1,312 sq mi
(3,398 km2)	State map highlighting Oswego County
Otsego County	077	Cooperstown	1791	Montgomery County	A Native American word meaning "place of the rock"	62.07	62,259	1,003 sq mi
(2,598 km2)	State map highlighting Otsego County
Putnam County	079	Carmel	1812	Dutchess County	Israel Putnam (1718.1790), an American Revolutionary War general	405.33	99,710	246 sq mi
(637 km2)	State map highlighting Putnam County
Queens County	081	none	1683	One of 12 original counties created in the New York colony	Catherine of Braganza (1638.1705), Queen of England and wife of King Charles II of England	12,512.46	2,230,722	178.28 sq mi
(462 km2)	State map highlighting Queens County
Rensselaer County	083	Troy	1791	Albany County	In honor of the family of Kiliaen van Rensselaer (before 1596 . after 1643), the early landholder in the Dutch New Amsterdam colony	239.74	159,429	665 sq mi
(1,722 km2)	State map highlighting Rensselaer County
Richmond County	085	none	1683	One of 12 original counties created in the New York colony	Charles Lennox, 1st Duke of Richmond (1672.1723), the illegitimate son of King Charles II of England	4,572.98	468,730	102.5 sq mi
(265 km2)	State map highlighting Richmond County
Rockland County	087	New City	1798	Orange County	Early settlers' description of terrain as "rocky land"	1,566.27	311,687	199 sq mi
(515 km2)	State map highlighting Rockland County
St. Lawrence County	089	Canton	1802	Clinton County, Herkimer County, and Montgomery County	The St Lawrence River, which forms the northern border of the county and New York State	39.68	111,944	2,821 sq mi
(7,306 km2)	State map highlighting St. Lawrence County
Saratoga County	091	Ballston Spa	1791	Albany County	A corruption of a Native American word meaning "the hill beside the river"	260.20	219,607	844 sq mi
(2,186 km2)	State map highlighting Saratoga County
Schenectady County	093	Schenectady	1809	Albany County	A Mohawk word meaning "on the other side of the pine lands"	736.80	154,727	210 sq mi
(544 km2)	State map highlighting Schenectady County
Schoharie County	095	Schoharie	1795	Albany County and Otsego County	A Mohawk word meaning "floating driftwood"	51.84	32,749	626 sq mi
(1,621 km2)	State map highlighting Schoharie County
Schuyler County	097	Watkins Glen	1854	Chemung County, Steuben County, and Tompkins County	Philip Schuyler (1733.1804), the American Revolutionary War general and Senator from New York	53.63	18,343	342 sq mi
(886 km2)	State map highlighting Schuyler County
Seneca County	099	Waterloo	1804	Cayuga County	The Seneca tribe of Native Americans	108.46	35,251	325 sq mi
(842 km2)	State map highlighting Seneca County
Steuben County	101	Bath	1796	Ontario County	Friedrich Wilhelm von Steuben (1730.1794), the Prussian general who assisted the Continental Army during the American Revolutionary War	70.51	98,990	1,404 sq mi
(3,636 km2)	State map highlighting Steuben County
Suffolk County	103	Riverhead	1683	One of 12 original counties created in the New York colony	The county of Suffolk in England	629.31	1,493,350	2,373 sq mi
(6,146 km2)	State map highlighting Suffolk County
Sullivan County	105	Monticello	1809	Ulster County	John Sullivan (1740.1795), an American Revolutionary War general	77.78	77,547	997 sq mi
(2,582 km2)	State map highlighting Sullivan County
Tioga County	107	Owego	1791	Montgomery County	A Native American word meaning "at the forks", describing a meeting place	97.75	51,125	523 sq mi
(1,355 km2)	State map highlighting Tioga County
Tompkins County	109	Ithaca	1817	Cayuga County and Seneca County	Daniel D. Tompkins (1774.1825), the 6th Vice President of the United States	213.37	101,564	476 sq mi
(1,233 km2)	State map highlighting Tompkins County
Ulster County	111	Kingston	1683	One of 12 original counties created in the New York colony	The Irish province of Ulster, then an earldom of the Duke of York, later King James II of England	157.19	182,493	1,161 sq mi
(3,007 km2)	State map highlighting Ulster County
Warren County	113	Queensbury	1813	Washington County	Joseph Warren (1741.1775), the early American patriot and American Revolutionary War general	75.53	65,707	870 sq mi
(2,253 km2)	State map highlighting Warren County
Washington County	115	Fort Edward	1772	Albany County	Originally Charlotte County, renamed in 1784 after George Washington (1732.1799), the American Revolutionary War general and first President of the United States	74.72	63,216	846 sq mi
(2,191 km2)	State map highlighting Washington County
Wayne County	117	Lyons	1823	Ontario County and Seneca County	General Anthony Wayne (1745.1796), the American Revolutionary War general	67.75	93,772	1,384 sq mi
(3,585 km2)	State map highlighting Wayne County
Westchester County	119	White Plains	1683	One of 12 original counties created in the New York colony	The city of Chester in England	1,898.23	949,113	500 sq mi
(1,295 km2)	State map highlighting Westchester County
Wyoming County	121	Warsaw	1841	Genesee County	A modification of a word from the Lenape language meaning "broad bottom lands"	70.73	42,155	596 sq mi
(1,544 km2)	State map highlighting Wyoming County
Yates County	123	Penn Yan	1823	Ontario County and Steuben County	Joseph C. Yates (1768.1837), eighth Governor of New York	67.41	25,348	376 sq mi
(974 km2)	State map highlighting Yates County