Whitepages.com is a site that provides listings for local businesses.
XYZScripts.com provides White Pages clone script - XYZ Directory
It is a PHP+MySQL powered script which helps you to launch a directory listing website like DMOZ, Yahoo Directory, White Pages etc.
XYZ Directory is enriched with features like unlimited items, unlimited categories, premium listings, home page listings, coupon code and much more. Within minutes you can create a site like White Pages.
XYZ Directory - White Pages Clone Script details