Major cities or places in California within area code 925 include: Area code 925 was created from a split of area code 510. Recently Reported Phone Calls in 925 Area Code. Concord and the surrounding areas were originally part of the 415 area code that covered all of central California. Area Code 925. In 1998, the area was split into two, with the area code 925 covering the inland section of East Bay. 1. Simply enter the phone number in the search box above to find out who called from that number. Did you get a call from 925 area code? So, if you are suffering from 925 area code scams, please add this phone number to our database and help others save their time from annoying calls. View the 925 area code map, major cities, location, timezone and more on TeraCodes.com. The list of scammer numbers is updated on a regular basis, and our users play a very important role in it: they add new numbers every day. Area code 925 is located in California and includes Concord. There have been a total of 105 reports for this area code. 925 Area Code Location History. Area Code 925 History: 03/14/1998 Area code 925 was officially put into service. Counties in California within area code 925 include: Alameda County, and Contra Costa County. Area Code 925 is in California and covers 1062.30 square miles. Area Code 925 contains 42 non-unique postal area zip codes. California (CA) Area Code 925 covers 2 Counties Area Code 925 Area Code 925 Covers These States. 925 Area Code Map In 1991, the area code 510 was established to represent most of the East Bay area. The following cities fall under this area code: Antioch, Bay Point, Brentwood, Concord, Danville, Dublin, Lafayette, Livermore, Martinez, Oakley, Pittsburg, Pleasant Hill, Pleasanton, San Ramon, Walnut Creek. 925 Area Code belongs to the state of California. 925 Area Code. 925-325-4027. By Anonymous 1 week, 6 days ago.