Whitepages.com - Look up individuals and businesses to get phone numbers, or reverse addresses and phone numbers to get names.
Area Code LocatorThis website provides a list of locations for all area codes in the USA, Canada and several Carribean Islands.
Zip Code Lookup from the U.S. Postal Service
International Country Calling Codes
AnyWho: Internet Directory Assistance
Pandia People Search
Reverse Phone Directory
Telephone Directories from IPL2.org
Yahoo! Directory of Phone Numbers and Addresses
Yahoo! People Search
Yellowbook.comSearch for people, email, or businesses. Covers the U.S. and Canada.