Jefferson County

Jefferson County, New York

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. 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. In 2014, it elected Colleen M. O'Neill as the first woman county sheriff in t…

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