Chino Hills, CA is currently using one area code which is area code 909. Area code 909 was created from a split of area code 714 and put into service on November 14, 1992.
In addition to Chino Hills, CA 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 service area.
Chino Hills, CA is located in San Bernardino County and observes the Pacific Time Zone. View our Times by Area Code tool.