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Jefferson County is a county on the northern border of the U.S. state of New York. As of the 2020 census, the population was 116,721. [1] Its county seat is Watertown. [2] The county is named after …

Jefferson County is located in the northern tier of New York State at the Junction of Lake Ontario and the St. Lawrence River. Jefferson County was originally inhabited by the Oneida Indian Nation which …

Sep 17, 2025 · Map of Jefferson County, New York showing cities, highways & important places. Check Where is Jefferson County Located, largest cities, population, areas, and travel info at Whereig.com.

Nestled in the northern border of New York state, Jefferson County is a picturesque blend of history, scenic landscapes, and a vibrant community. Established in 1805 and named after Thomas …

May 14, 2025 · Jefferson County, NY is located near the Canadian border (approximately 70 miles north of Syracuse) and includes the Thousand Islands. It is the home to beautiful outdoors as well as …

This guide for Jefferson County contains a detailed list of resources for those researching families that lived there. The guide includes a map of municipalities, a brief county history, as well as links to …

Welcome to the official website of Jefferson County New York Departments Government Services

Explore Jefferson County, NY map with detailed charts and insights into its population, demographics, household information, and more.

Jefferson County is at the top of New York, where the St. Lawrence River meets Lake Ontario. It has islands, lighthouses and military history