To look up phone numbers in the United States, visit YellowPages.com, WhitePages.com or AnyWho.com. The website 192.com offers a list of U.S. phone directories with both phone numbers and addresses. It allows you to look up phone numbers using an individual's name, ZIP code, city or state.
WhitePages.com offers mobile apps to look up phone numbers on the go. Use the site to identify unknown callers. These websites also provide reverse phone look-up service and are useful for looking up both residential and business phone numbers. YellowPages.com also allows you to find more information about a person. There is no charge for using any of these websites.