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Folsom is a city in northeastern Sacramento County, California, United States. A population estimate on January 1, 2026, puts the city's population at 95,680 residents. Folsom is well known for its Gold Rush history, dating back to the mid 19th century. It is also associated with musician Johnny Cash and the Folsom State Prison, located in the northwest area of the city, and as a major hub for outdoor recreation centered around Folsom Lake and Lake Natoma.