West Covina (mostly in the 626 area code) Riverside County Calimesa Corona (mostly in the 951 area code) Eastvale (mostly in the 951 area code) San Bernardino County Big Bear City Big Bear Lake Bloomington Blue Jay Chino Hills (small portion in the 657/714 area code) Chino Colton Crestline Fontana Grand Terrace Highland Lake Arrowhead Loma Linda Lytle Creek Mentone Montclair Muscoy Ontario Rancho Cucamonga Redlands Rialto Running Springs San Antonio Heights San Bernardino Sugarloaf Upland Yucaipa See also List of California area codes List of NANP area codes North American Numbering Plan References External links North American Numbering Plan Administration 909 San Bernardino County, California Riverside County, California Inland Empire Pomona Valley San Bernardino, California Telecommunications-related introductions in 1992 909