AllAreaCodes.com »
Look up area codes by state, or search area codes numerically to find out what cities they serve.

Anywho »
Directories by AT&T Labs - Toll-free numbers of 150,000 businesses and organizations searchable by category or name. http://www.anywho.com/tf.html

InfoSpace »
Search the Web's most comprehensive directory with more than 112 million listings of people, businesses, government offices, toll-free numbers, fax numbers, e-mail addresses, maps and URL's in one integrated database. Look up the address and phone number of a friend and print off driving instructions and a map. Also includes a celebrity directory.

Internet 800 Search »
More comprehensive than the AT&T directory, this resource lists 800 and 888 toll-free numbers for over 300,000 businesses regardless of long distance provider.

Switchboard »
106 million residential listings and 11 million business listings in this telephone directory.

Infobel.com »
A comprehensive collection of phone, fax, and email directories from 170 countries around the world.