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Whitepages.com. You just type in the phone number and if it's listed, it gives you the address.

As long as it's not a private residential number, they'll do it. Of course, nowadays you can just do a reverse address search online.

The best screening process I've ever encountered was an add for "tree climber wanted" put up on the college job board at WWU. No company or persons name was given, just a number. If you called the number, nobody ever answered. Finally, I called the phone company and got the address and went...