Map of Jefferson County Map, New York

Written and Fact-checked by | Updated On: September 17, 2025, 14:10 ET

Map of Jefferson County - Jefferson County is a county located in the U.S. state of New York. Jefferson County Map showing cities, highways, important places and water bodies. Get Where is Jefferson County located in the map, major cities in Jefferson county, population, areas, and places of interest.

Map of Jefferson County, New York

Map of Jefferson County, New York

About Jefferson County Map, New York: The map showing the county boundary, county seat, major cities, highways, water bodies and neighbouring counties.

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About Jefferson County, New York

Jefferson County is a county located in the U.S. state of New York. It's county seat is Watertown. As per 2020 census, the population of Jefferson County is 116295 people and population density is 62.63 square miles. According to the United States Census Bureau, the county has a total area of 1,857 sq mi (4,810 km2). Jefferson County was established on 1805.

Facts about Jefferson County, New York

CountryUnited States
StateNew York
RegionNorthern New York / North Country
County SeatWatertown
FoundedMarch 18, 1805
Named ForThomas Jefferson (third U.S. President)
Coordinates~44.00° N, 75.99° W
Total Area~1,857 sq mi
Land Area~1,269 sq mi
Water Area~588 sq mi
Water %~32%
Population (2020)~116,721
Estimated Population (2024)~114,787
Population Density~92/sq mi
Largest MunicipalityWatertown
Other Towns & CommunitiesAdams, Alexandria Bay, Carthage, Clayton, Sackets Harbor
Main IndustriesMilitary (Fort Drum), Tourism, Agriculture, Services
Major HighwaysI‑81, U.S. 11, NY‑3, NY‑12, NY‑180
Time ZoneEastern Time (UTC−05:00)
Known ForFort Drum military base, Thousand Islands & St. Lawrence River, Black River, outdoor recreation
Websitehttps://www.jeffersoncountyny.gov/

Top Attractions in Jefferson County, New York

  • Thousand Islands Region – Scenic islands and boat tours.
  • Boldt Castle – Iconic castle on Heart Island.
  • Sackets Harbor Battlefield – War of 1812 historic site.
  • Watertown Public Square – Downtown shops and dining.
  • Fort Drum Military Museum – U.S. Army history exhibits.
  • Black River – Fishing and paddling river.
  • Thompson Park – Zoo, trails, and city views.
  • Jefferson County Historical Society – Local history museum.
  • Sandy Pond – Fishing and waterfront recreation.
  • Southwick Beach State Park – Sandy Lake Ontario beach.
  • Antwerp Village Historic Area – Small-town historic charm.
  • Cape Vincent Lighthouse – Scenic lighthouse views.

Cities & Towns in Jefferson County, New York

Watertown, Adams, Carthage, Cape Vincent, Alexandria Bay, Black River, Sackets Harbor, Clayton, Lyme, Champion, Le Ray, Lorraine, Pamelia, Theresa, Hounsfield, Orleans, Champion Center, Antwerp, La Fargeville