National Capital Velo Club
Founded in 1970 an amateur bicycle racing club; features include race calendar and results, image gallery and membership information.

Potomac Pedalers Touring Club
Offers members a downloadable mileage log along with ride schedule, cue sheet library, a tandem riders group, classified ads, and riding tips.

Washington Area Bicyclist Association
Bicycle advocacy group for the Washington D.C. metro area. Contains news, events, issues and campaigns, paths and trails.