http://www.usacycling.org/cycling-advocacy-organizations.htm
http://en.wikipedia.org/wiki/List_of_United_States_bicycle_advocacy_organizations
Southern Bicycle League: http://bikesbl.org
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http://bikesbelong.org/
League of American Bicyclists — Promotes bicycling for fun, fitness and transportation while working through advocacy and education for a bicycle-friendly America.
Rails-to-Trails Conservancy — A nonprofit organization that works to create a nationwide network of trails from former rail lines and connecting corridors to build healthier places for healthier people.
http://nbg.bikeroute.com