http://www.bennetyee.org/ucsd-pages/area.h tml

I typed in area codes in google and this is what came up, and it looks like what you are looking for.

Hi ,
Don’t worry. It is really simple to find the state name of existing numbers. I would refer to you a site called http://www.areacodelookup.org/ where you just have to put the phone number in the given text box and it returns the state and city names within seconds. Please let me know weather it is useful to you or not and feel free to ask about any other query you have.
Good luck!