Jefferson County, Administrative county in northern New York, US
Jefferson County is an administrative county in northern New York that spans forests, farmland, and shorelines shaped by natural boundaries. The St. Lawrence River forms a major border and includes the Thousand Islands region, where numerous small islands dot the waterway.
The territory was established as a county in 1805, separated from the original Albany County. Over time, boundary adjustments were made as it developed into an important part of New York State.
The area is deeply connected to military life, particularly through Fort Drum, where the 10th Mountain Division is based and shapes the local community.
Watertown is the largest city and serves as the administrative center, offering good transportation connections throughout the region. Visitors can find accommodations, dining options, and services to support a comfortable stay.
The Black River flows through the county and empties into Lake Ontario, creating a historically important water route and power source for the region's development. This river has long influenced economic activity in the area.
Location: New York
Inception: 1805
Capital city: Watertown
Shares border with: St. Lawrence County, Oswego County, Lewis County
Website: http://co.jefferson.ny.us
GPS coordinates: 43.99000,-76.05000
Latest update: December 17, 2025 09:03
Boldt Castle
40.8 km
Thousand Islands Bridge
40.1 km
Collins Bay Institution
48.6 km
Fort Frontenac
43.7 km
CFB Kingston
42.3 km
Heart Island
40.7 km
Thousand Islands National Park
41.1 km
Carleton Island
28.3 km
Zavikon Island
43.6 km
Fort Henry
42.3 km
Kingston General Hospital
44 km
Prison for Women
45.2 km
Southwick Beach State Park
27.5 km
Howe Island
36.4 km
Wellesley Island State Park
38.1 km
George C. Boldt Yacht House
40.9 km
Kingston City Hall
43.6 km
Madison Barracks
6.3 km
Richardson Memorial Stadium
45.7 km
Cataraqui Cemetery
49.7 km
Paddock Arcade
11.3 km
Kingston Royal Naval Dockyard
42.7 km
Bellevue House
44.6 km
LeRay Mansion
23.9 km
Kingston Memorial Centre
45.4 km
International Hockey Hall of Fame
45.3 km
Agnes Etherington Art Centre
44.3 km
Sackets Harbor Battlefield State Historic Site
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