Saratoga County is a county in the U.S. state of New York, and is the fastest-growing county in Upstate New York. As of the 2020 U.S. census, the county's population was enumerated at 235,509, its highest decennial count ever and a 7.2% increase from the 219,607 recorded at the 2010 census, representing one of the fastest growth rates in New York. The county seat is Ballston Spa. The county is part of the Capital District region of the state.