From RRT Regional Reference Tools:
Reverse Area Code Lookup - Info On Every Area Code. Search by state or number. This simple program pulls up regional information, major cities, overlaying area codes, and more. Also includes a reverse phone/cell phone lookup tool to find out who owns an unlisted phone number. Download now and find what you're looking for in two clicks or less.
What's new in this version:
This version is the first release on CNET Download.com