Area Code 909 History:
Area code 909 was put into service. Area code 909 was created from a split of area code 714. In 2004 area code 909 was split to form area code 951.
Counties in California within area code 909 include:
Los Angeles County, Riverside County, and San Bernardino County.
Major cities or places in California within area code 909 include:
Area code 909 serves a portion of eastern Los Angles County, southwest San Bernardino County, and a few communities in Riverside County including the larger cities and communities of Chino, Chino Hills, Claremont, Colton, Diamond Bar, Fontana, Highland, La Verne, Montclair, Ontario, Pomona, Rancho Cucamonga, Redlands, Rialto, San Bernardino, San Dimas, Upland, and Yucaipa in addition to many smaller communities within the area code 909 service area.