Napa State Hospital is a psychiatric hospital in Napa, California, founded in 1875. It is located along California State Route 221, the Napa-Vallejo Highway, and is one of California's five state mental hospitals. Napa State Hospital holds civil and forensic mental patients in a sprawling 138-acre campus. According to a hospital spokesperson, there were 2,338 people employed at the facility during the 2016 to 2017 fiscal year, making it one of the region's largest employers.