A compiled list of national associations in order by state (credit to the University of Connecticut)

Carnegie - Mellon Institute for Talented Elementary and Secondary Students

SENG: Supporting Emotional Needs of the Gifted

Davidson Institute for Talent Development

National Society for the Gifted & Talented

National Association for Gifted Children

Johns Hopkins Center for Talented Youth

The Mensa Education & Research Foundation

Duke University TIP (talent identification program)

Center for Bright Kids