Who? Where? (http://whowhere.com/)
Provides access to individual and business e-mail addresses as well as phone numbers. 

AnyWho Toll Free Internet Directory (http://www.anywho.com/tf.html)
All 800 numbers. 

Big Yellow (http://www.bigyellow.com)
Yellow pages for the entire U.S. 

Reverse Lookup  ( http://www.infospace.com/info/reverse.htm) 
Find people by phone number or address. 

Switchboard Home Page (http:/www.switchboard.com)
White Pages, Yellow Pages, maps, the works, with a great search tool! You can even search local directories. 

Telephone Directories on the Web (http://www.contractjobs.com/tel)
Another phone book site? Well, this one is a little different. It offers you access to the searchable white pages from over 45 countries throughout the world. 

Yahoo! People Search  (http://people.yahoo.com/) 
Provides directory assistance, including phone numbers and e-mail addresses. 
 

Free ZIP code Lookup (http://zipinfo.com/search/zipcode.htm)
This site helps you find a zip code. You can also find the county name, time zone,
area code, latitude/longitude, and congressional district. 

U.S. Postal Service Zip Codes ( http://www.usps.gov/ncsc/) 
Provides zip code, zip +4, official abbreviations, etc. on U.S. locations.