Area code 510
California, much like the rest of the country, underwent a crisis when it seemed available numbers were running out in each area code. The state originally had three area codes, and that number rose to thirteen by the year 1997. What is interesting is that it only took three more years (to the year 2000) for the numbers to almost double. As of 1999, there were at least 25 area codes within the state.
Area code 510 was one of the codes made as the result of a split. It came into being in 1999 and then was split into yet another code later one down the road. Though this area is not directly on the coast of California, which tends to be the most populated areas of the state, it is close. That means the demand for numbers is high, and it is not out of the question to think the code 510 may indeed be split again in the future.
There are some areas covered by the area code 510 that may be the source of any anonymous calls that you may be getting in your home or on your cellular phone. Some of the areas and cities included in this area code are Berkeley, Fairview, Fremont, Oakland, Newark, Union City, and San Pablo in Alameda county. From Contra Costa county some areas include Bayo Vista, Kensington, North Richmond, Rollingwood, San Pablo, Tormey, and Valle Vista.
If you are getting area code 510 calls, and you know no one in those areas, you may have to do a bit of research to find out who is calling you. Luckily for you, finding the origin of any phone call is much easier than it has ever been before. You can use reverse cell phone lookup when a mobile number calls, or you may have luck with yellow or white page reverse lookup for landline numbers.

