Jefferson -- U.S. County in New York Population (2000): 111738 Housing Units (2000): 54070 Land area (2000): 1272.201758 sq. miles (3294.987287 sq. km) Water area (2000): 584.876374 sq. miles (1514.822790 sq. km) Total area (2000): 1857.078132 sq. miles (4809.810077 sq. km) Located within: New York (NY), FIPS 36 Location: 44.038673 N, 75.944575 W Headwords: Jefferson Jefferson, NY Jefferson County Jefferson County, NY