The New England Skeptical Society (Popularity: )
http://www.theness.com U.S. regional organization dedicated to the promotion of science and reason, particularly the investigation of paranormal and pseudoscientific claims.
Tampa Bay Skeptics (Popularity: )
http://www.tampabayskeptics.org/ A nonprofit scientific and educational organization that critically examines paranormal and fringe-science claims and publishes a quarterly newsletter.