Adirondacks & North Country
Jefferson County, New York
County seat: Watertown
Jefferson County borders Lake Ontario and the St. Lawrence River, anchored by Watertown and the Fort Drum military installation. Its shoreline includes the Thousand Islands, a summer boating and cottage destination.
Cities, Towns & Communities
- Watertown
- Carthage
- Sackets Harbor
- Clayton
- Alexandria Bay
- Cape Vincent
1 full community guide available in this county.
Attractions
- Thousand Islands
- Boldt Castle
- Sackets Harbor Battlefield
Parks & Recreation
- Wellesley Island State Park
- Southwick Beach State Park
- Robert G. Wehle State Park
Transportation
I-81 runs from Syracuse to the Thousand Islands Bridge, and Route 3 follows the Lake Ontario shore.
Frequently Asked Questions
What is the county seat of Jefferson County?
Watertown is the county seat and largest city.
Where are the Thousand Islands?
The Thousand Islands stretch along the St. Lawrence River between Jefferson County and Ontario.