1)   Free Area Code Selector 1.0
International Area Codes, A collection of all international area codes in the world. Free Download. The program is quite simple so even if you are a beginner you can use it without any trouble.

 2)   Zip Code Companion 4.12
Zip Code Companion is a handy database that allows you to quickly find or verify zip codes, cities, states and area codes within the USA.

 3)   The Phone Exchange 1.00
A database reference tool that allows you to take any US and Canadian phone number and determine its physical location and local time using the 3 digit area code and 3 digit exchange.

 4)   Zipkey 6.06E
If you type US addresses into any Windows program, ZIPKEY will speed your job and improve your accuracy. You type the zipcode, and ZIPKEY types out the city, state, etc. for you Instantly look up telephone area codes and time zones as well.