Directories (Finding People)
555-1212.com – White/yellow pages, toll free numbers, reverse lookup, area and zip codes plus much more.
Anywho – AT&T white & yellow pages
Dex Internet Yellow Pages
InfoSpace – Reverse phone number listing for U.S. & Canada.
Internet 800 Directory
Switchboard – Telephone numbers
International phone listings – This is the Internet’s original and most complete index of online phone books, with over 400 links to Yellow Pages, White Pages, Business Directories, Email Addresses and Fax Listings from over 170 countries all around the world.
US Postal Service Zip+4