Set up "Areas" for more easily managing mailing and lists.

An Area is defined as a group of zip codes.
If you find yourself having to enter many zip codes and zip code ranges each time you need to generate lists and mailings, this feature is for you.

You can define as many "Areas" as you need to, and add zip code and zipcode ranges to these areas.

To set up Areas, click Tools > Custom List Setup > Areas

When you make a reports (Reports > Contacts), you can limit the resulting output to a predefined Area. This option is on the Demographic tab.