Jefferson County is located in the northern part of New York State, and is part of the Watertown-Fort Drum Metropolitan Statistical Area. The county seat is Watertown.

The county is governed by a Board of Legislators, which consists of 21 members. The county is divided into seven legislative districts, each of which elects three legislators. The county executive is elected by the voters of the county.

The county is home to Fort Drum, a major U.S. Army installation. The county is also home to the Thousand Islands, a popular tourist destination.

The county is served by the Jefferson Community College, which is part of the State University of New York system. The county is also served by the Jefferson-Lewis Board of Cooperative Educational Services, which provides educational services to the county's school districts.

The county is served by the Watertown International Airport, which provides air service to the region. The county is also served by the Thousand Islands Bridge, which connects the county to Canada.

For the most up-to-date and in-depth information, please check the public records links below.