What is what area code is 657?

Area code 657 is a California area code that covers the western portion of Orange County. It's an overlay code, meaning it shares the same geographic region with existing area codes, specifically 714 and 626. This was implemented to address the increasing demand for phone numbers in the area. It began service on October 27, 2008. The area it serves includes cities like Anaheim, Fullerton, and Santa Ana.