San Jacinto is a city in Riverside County, California, U.S.A. It was named after Saint Hyacinth and is located at the north end of the San Jacinto Valley, with Hemet to its south. The mountains associated with the valley are the San Jacinto Mountains. The population was 44,199 at the 2010 census. The city is home to Mt. San Jacinto College, a community college which has served the valley and Inland Empire for over 40 years since 1965.