American Speech, Language and Hearing Association (ASHA) is the national association for Speech and Language Therapists and Audiologists. This association provides information to the public about services and other related information. 

http://www.asha.org/public

Stuttering Information/Help

National Stuttering Association http://www.nsastutter.org/

The National Center for Stuttering http://www.stuttering.com

Stuttering Foundation of America http://www.stutteringhelp.org