How can I find area codes that have a certain exchange number?

I have a phone number with no area code but an otherwise complete phone number with exchange. How can I find out which area codes have this exchange number?|||you can check here http://www.telcodata.us/telcodata/telco?鈥?/a>





but you should really try to narrow down your search... there are way too many area codes to go thru one by one... if you have a state, or something like that, you could reduce the odds of finding the proper area code from hundreds, to just a hand full...|||If you are looking for a number in the North American Numbering Plan, go to http://localcallingguide.com/lca_prefix.鈥?/a> and enter the three-digit prefix in the NXX box.