From PC Shareware:
The ZIP Code Distance Wizard allows you to locate ZIP Codes that are within close proximity of a specified ZIP Code. For example, let's say that you are a direct marketer and you want to send out a mass mailing to all addresses within a 50 mile radius of a particular ZIP Code. But how do you know what ZIP Codes are within a 50 mile radius of a specific ZIP Code? Or perhaps you are a sales person who obtains commissions based on sales that occur within a 100 mile radius of your office, and you need to know what ZIP Codes fall within that radius? This is where the ZIP Code Distance Wizard can assist you.
All you do is type in a ZIP Code, specify the radius distance in miles, and within seconds, a list of ZIP Codes that fall within that radius is displayed. The ZIP Code Distance Wizard permits you to export or copy the results to either a comma separated value (CSV) file, or to the Windows Clipboard. Includes every 5 digit ZIP code in the USA. (42,000+ entries). The program is updated regularly so the data it contains remains current.