Located in the state of California and a city in San Jacinto Valley that is in Riverside County. Hemet covers an area that is half the size of the valley, which it also shares with the neighboring city of San Jacinto. The founding of Hemet antedates the formation of Riverside County where it is currently located. When the formation of Lake Hemet, it helped the city grow and stimulated the agriculture industry of the area. Home to The Ramona Pageant, California’s official outdoor play, is the longest-running outdoor play in the whole of the United States.