Companies (Directories) - E-Mail Directories
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555-1212.com
Here you can look up area codes and zip codes.

Any Who Directories by AT&T Labs
Includes toll free (800) numbers.

SuperPages.com
Through SuperPages.com you can search for business on a map, near an address, by street, ZIP code, and by catagory - in addition to name. And more!

Info Space
This site includes "Reverse Lookup" for people.

SMARTpages.com
Search Bell's SMARTpages.com business guide by company name or business type; includes maps of US cities.

Switchboard
Switchboard is a directory with 90 million people and 10 million businesses. And it is FREE! And you can register if you want to be in the database (if you are not already). The first and last names are in different fields; so you can limit your searches to the last name only.

Zip Codes (USPS)
From the US Postal Service.