Broome County is a county in the U.S. state of New York. As of the 2020 United States census, the county had a population of 198,683. Its county seat is Binghamton. The county was named for John Broome, the state's lieutenant governor when Broome County was created. The county is part of the Southern Tier region of the state. The county is part of the Binghamton, NY Metropolitan Statistical Area.