Perris is a city in Riverside County, Southern California, United States, located 17.6 miles south of Riverside, California, 80.9 miles north of San Diego, California, and 93.4 miles north of the Mexican border. At the 2010 census, the city population was 68,386, up from 36,189 at the 2000 census. Perris is within the Inland Empire metropolitan area of Southern California.