You might want to try these library tools:
Reference USA
This online tool searches US Postal Service data, including the National Change of Address updates (NCOA). You can search by last name, first name, city or state to find addresses and phone numbers. It’s a lot like the “people search” sites you find on the web, except there are no advertisements and no fees. Note: Reference USA is a premium site available to all Arlington Public Library cardholders.
Haines Criss-Cross Directory
If you know your friend’s street address and are looking for a phone number, we can help you use the Haines Directory. This print reference book is shelved at the Central Library Reference Desk, and lists local addresses and their corresponding telephone numbers.
Keep in mind that cellphone numbers and unlisted numbers won’t appear in either resource.
Still no luck? Cast a wider net with these online sites:
WhoWhere.com
This people-finding site is free and easy to use, with minimal ads. Just enter a name to get address and phone number results.
Facebook.com
Facebook is a social utility that connects people with their friends. The site has 250 million members, and the fastest growing demographic is those 35 years old and older. Facebook has decent privacy controls, so even if you find your friend listed you’ll need to join the site and have your “friend request” approved before you’ll be able to contact the person directly.
LinkedIn.com
An online networking tool for professionals, LinkedIn has 46 millions members and can be one way to locate classmates or colleagues. You’ll again need to join the site, but afterwards you can view resume-like contact information about other members.
Social Security Death Index from Ancestry.com
This searchable index is a copy of Social Security’s Death Master File, a record of deceased persons possessing social security numbers and whose deaths were reported to the SSA (so the absence of a particular person in the SSDI is not proof this person is alive).
Have a question you’d like to see answered in this space? Let us know.