Jefferson County, New York
Panoramic view of Boldt Castle on Heart Island
Flag
Location in the state of New York
New York's location in the U.S.
Founded	1805
Named for	Thomas Jefferson
Seat	Watertown
Largest city	Watertown
Area
• Total	1,857 sq mi (4,810 km2)
• Land	1,269 sq mi (3,287 km2)
• Water	589 sq mi (1,526 km2), 32
Population
• (2010)	116,229
• Density	92/sq mi (36/km²)
Time zone	Eastern: UTC-5/-4
Website	www.co.jefferson.ny.us
Footnotes: For infobox source see

County Well Data

Well ID	Municipality	Operator Name	Permit Date	Spud Date	Configuration	Well Status
31-045-00844	Adams	White Rufus		1891-04-01	Vertical	Unknown
31-045-01034	Watertown	Black River Gas & Fuel		1890-01-01	Vertical	Unknown
31-045-01035	Rodman	Unknown		1886-01-01	Vertical	Unknown
31-045-02289	Brownville	Village of Dexter			Vertical	Unknown
31-045-02671	Watertown	Springstein		1951-01-01	Vertical	Unknown
31-045-04807		Unknown		1941-10-08	Vertical	Unknown Not Found
31-045-04808		Unknown		1941-10-25	Vertical	Unknown Not Found
31-045-04809		Unknown		1941-11-05	Vertical	Unknown Not Found
31-045-04810		Unknown		1941-12-08	Vertical	Unknown Not Found
31-045-04811		Unknown		1940-11-11	Vertical	Unknown Not Found
31-045-04812		Unknown			Vertical	Unknown Not Found
31-045-04813		Unknown		1941-01-02	Vertical	Unknown Not Found
31-045-11224	Ellisburg	White Rufus		1899-01-01	Vertical	Unknown
31-045-11226	Adams	White Rufus		1891-08-01	Vertical	Unknown
31-045-60000	Hounsfield					Unknown

For data sources see