Jefferson County, New York
| Jefferson County, New York | |
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Old Jefferson County Courthouse
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 Location in the U.S. state of New York |
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 New York's location in the U.S. |
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| 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) |
| Congressional district | 21st |
| Time zone | Eastern: UTC-5/-4 |
| Website | www |
Jefferson County is a county in the U.S. state of New York. As of the 2010 census, the population was 116,229. Its county seat is Watertown. The county is named after Thomas Jefferson, third President of the United States of America. It is adjacent to Lake Ontario, southeast from the Canada–US border of Ontario.
Jefferson County comprises the Watertown-Fort Drum, NY Metropolitan Statistical Area.
The U.S. Tenth Mountain Division is based at Fort Drum.
When counties were established in the Province of New York in 1683, the present Jefferson County was part of Albany County. This was an enormous county, including the northern part of New York State as well as all of the present State of Vermont and, in theory, extending westward to the Pacific Ocean. This county was reduced in size on July 3, 1766 by the creation of Cumberland County, and further on March 16, 1770 by the creation of Gloucester County, both containing territory now in Vermont.
On March 12, 1772, what was left of Albany County was split into three parts, one remaining under the name Albany County. One of the other pieces, Tryon County, contained the western portion (and thus, since no western boundary was specified, theoretically still extended west to the Pacific). The eastern boundary of Tryon County was approximately 5 miles (8.0 km) west of the present city of Schenectady, and the county included the western part of the Adirondack Mountains and the area west of the West Branch of the Delaware River. The area then designated as Tryon County now includes 37 counties of New York State. The county was named for William Tryon, colonial governor of New York.
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