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SwitchBoard - REVERSE phone lookup - also find a buisness, city by area code, people search etc

ANYWHO.Com On-line directory - Find phone numbers and address of people and buisnesses

PeopleSearch - Find phone numbers and addresses - also search by using a phone number of person or buisness

zip4.usps.com - Find any zip code by entering an address

The Search Systems Free Public Records Directory