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is a city in Riverside County, California, U.S.A. It was named after Saint Hyacinth, and it is located at the north end of the San Jacinto Valley, with Hemet to its south. The city is known for its giant, white, "S", painted above the town, on North Mountain, which Valley-faithful residents light up for San Jacinto High School's annual homecoming football game. The city population was 23,779 as per the 2000 census. Mount San Jacinto College, a junior community college serves the Inland Empire region for over 40 years, and the ballpark is home to the semi-pro collegiate team, the Sou-Cal Tremors. San Jacinto is also home to the Soboba Casino, a gaming casino owned and operated by the Soboba Band of Luiseno Mission Indians.
According to the United States Census Bureau, the city has a total area of 25.3 square miles (65.5 km²), of which, 24.9 square miles (64.5 km²) of it is land and 0.4 square miles (1.0 km²) of it (1.50%) is water.
The San Jacinto reservoir is the man-made lake used as a basin for the San Diego Aqueduct, a branch of the Colorado River Aqueduct west of town.