Perris is a city in Riverside County, California, in the United States. As of the 2000 census, the city population was 46,600. The city is named in honor of Fred T. Perris, chief engineer of the California Southern Railroad; the California Southern connected through the city in the 1880s to build a rail connection between the present day cities of Barstow and San Diego. Perris apartments for rent comparison page shows most up to date rent information on Perris apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.