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 925 serves the state of California.
The Table Below Shows the Towns and Cities That Use Area Code 925
| Acalanes Ridge Alamo Alhambra Valley Antioch Bay Point Bethel Island Blackhawk Brentwood Byron Camino Tassajara | Castle Hill Clayton Clyde Concord Danville Diablo Discovery Bay Dublin Knightsen Lafayette Livermore | Martinez Moraga Mountain View Norris Canyon North Gate Oakley Orinda Pacheco Pittsburg Pleasant Hill | Pleasanton Reliez Valley San Miguel San Ramon Saranap Shell Ridge Sunol Vine Hill Contra Costa Centre Walnut Creek |