The History of area code 925. Area code 925 is a split from the area code 510 that was used in the area up until March 14, 1998. It is considered a fairly new area code. The area was originally part of the 415-area code, which was established in the year 1947. In 1991, a new area code 510 was created to help with the increased demand for.. The 925 area code was created to relieve some of the strain on 510, which was running out of phone numbers. At the time, 925 was projected to have enough numbers to last until 2029. However, due to the growth of the Bay Area and the popularity of cell phones, 925 is now projected to run out of numbers by 2021.

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Area code 925 is a telephone area code in the North American Numbering Plan for a northern part of the U.S. state of California. It was created in an area code split of area code 510 in 1998. The numbering plan area comprises the inland portions of the East Bay counties of Alameda and Contra Costa.. 925 is an area code located in the state of California, US. The largest city it serves is Concord. Location, time zone and map of the 925 area code