City (pop., 2000: 185,410), southern California, U.S. It is located about 62 mi (100 km) east of Los Angeles .
It was laid out as a town by Mormon s in 1852 and developed as a trade centre chiefly for the surrounding citrus groves and vineyards. Other industries, including aerospace, electronics, and steel, are now the economic mainstays. It is part of the San Bernardino–Riverside–Ontario metropolitan complex.