The size of phone books varies enormously. I've seen phone books that were about the size of a National Geographic magazine—for a small town in a rural area.

http://www.411.com/
http://www.anywho.com/
http://www.dexknows.com/
http://whitepages.langenberg.com/
http://www.phonebookoftheworld.com/
http://www.superpages.com/
http://www.switchboard.com/
http://www.whitepages.com/
http://www.whowhere.com/
http://people.yahoo.com/
http://www.zabasearch.com/
http://www.ziplocal.com/