Area Code Map Page

What if every area code were the same size? Here's the Eiler Technical Enterprises map of what the United States and Canada would look like.

I can also recommend the following area code maps and resources.

Legacy IS, Networking & Communications Solutions. The most up to date area code maps I've seen. They not only know about area codes the Baby Bells haven't seen fit to tell us of yet, they're got the boundaries for the area codes that come out after that.
Linc Madison's Telecom Page. A set of maps for the history of area codes.
Aegis Books. They'll be happy to sell you one of their maps. It's not quite the most up to date (despite their claims), but it's the prettiest.