Trail Riders of Today (TROT)
- Dedicated to the preservation of existing equestrian trails and the establishment of new trails. Profile, events and newsletters.
- http://www.trot-md.org/

Potomac Valley Dressage Association
- A non-profit organization devoted to Dressage and the love of horses. Based in the Washington DC metro area and surrounding states, it offers clinics, schooling and recognized shows, and educational forums.
- http://www.pvda.org/

Horse Stables
- Living or Vacationing in Maryland? Your resources to Maryland's Recreation and Sports.
- http://www.delmarweb.com/maryland/horsestables.html