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 the northeastern United States; and despite the worldwide toll of the COVID-19 pandemic in the early 2020s, Saratoga County has continued its rapid growth. The county seat is Ballston Spa. The county is part of the Capital District region of the state.

Ballston Spa is a village and the county seat of Saratoga County, New York, United States, located southwest of Saratoga Springs. It is part of the Capital Region. The population of the village, named after Rev. Eliphalet Ball, a Congregationalist clergyman and an early settler, was 5,111 at the 2020 census. Ballston Spa lies on the border of two towns, situated partly in the Town of Ballston and partly in the Town of Milton. The Ballston Spa School District encompassing most of the combined towns of Milton, Malta, and Ballston is often referred to locally as ‘Ballston Spa’ with the village proper being referred to as ‘The Village’ or 'Town'.