what county is jefferson, oh in
Welcome From Mayor Judy Maloney. Welcome to the Village of Jefferson, Ohio. Situated in the Northeast corner of Ohio it is ten miles from Lake Erie and ten miles from the Pennsylvania border. Jefferson is the Ashtabula County seat. Ashtabula County is the largest county in the state of Ohio, while being the least populated. The Village of Jefferson is a family oriented community with an all American, hometown environment. The Village is committed to education, planned development and economic growth.