Find any 925- phone number in California

The telephone area code 925 is one of the original area codes from the 1947 North American Numbering Plan (NANP). It was established to cover central California's East Bay and some of the northern section of Contra Costa County. It includes the cities of Concord, Martinez, Richmond, Walnut Creek, and Pleasanton.

The NANP is an integrated system of telephone numbering and initiating services maintained through an agreement between the United States and Canada. It is the Worldwide Numbering Plan (WNP) in the North American Telecommunications Association (NATPA). In the NANP, each area code is used to identify a particular geographic region, with each area code made up of three digits. These are combined with a unique seven digit local number to form a complete telephone number. Each geographic region is given a specific area code in order for the numbers to remain meaningful and distinct from each other.