According to InfoSpace.com:
New World Educational Center
1313 North 2nd Street
Phoenix, AZ 85004
602-238-9577
And, checking a couple of other states I found:
New World Educational Center
13737 Farmers Boulevard
Jamaica, NY 11434
718-528-8751
New World Educational Center
205 Moore Avenue
Freeport, NY 11520
516-623-6409
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For interesting Watchtower Society literature quotes, complete with references but without any editorial, check out:
http://Quotes.JehovahsWitnesses.com