What is an Area Code? An area code is a section of a telephone number that denotes the broad area that the phone receiving the call is based in. Area codes were first introduced circa 1947 for operator use only. Area codes are three-digit numbers that represent Numbering Plan Areas (NPAs). The area code for a particular city or region is the series of numbers that you have to dial before someone’s number if you are making a phone call to that place from a different area. Area code 909 serves the state of California.
The Table Below Shows the Towns and Cities That Use Area Code 909
| Big Bear City Big Bear Lake Bloomington Calimesa Chino Chino Hills Claremont Colton Crestline | Diamond Bar Fontana Grand Terrace Highgrove Highland Industry Lake Arrowhead La Verne Loma Linda | Lytle Creek Mentone Montclair Muscoy Oak Glen Ontario Pomona Rancho Cucamonga Redlands | Rialto Running Springs San Antonio Heights San Bernardino San Dimas Upland Walnut Yucaipa |