Back Country Horsemen Of Colorado -- their mission is to preserve the historical right to use horses and mules in the back country through education, information, and outreach programs.
Back Country Horsemen Of America -- is a non-profit corporation made up of state organizations, affiliates and at large members. 
Minnesota Trail Riders Association -- Info on trail development, publicized trail rides, and a newsletter.
Oregon Equestrian Trails -- dedicated volunteers of Oregon Equestrian Trails work hard to design, build, and maintain horse camps and trails throughout the state.
petssquare  -- is designed to be your one-stop destination for anything you can think of that is about or related to Pets companies.
horsetraildirectory -- You will find information about trails, horse campgrounds, overnight stay facilities, and bed & breakfasts; including ratings of horse trails and campgrounds and trail-specific weather forecasts.  

horses.equiworld -- the internet's most extensive equestrian resource

horseshowcentral -- helps shows and associations attract exhibitors who want information at their fingertips.
Plenty Star Ranch -- Horse Campground, Guest Ranch & Campground
Valley Vista Boarding Stables & Equestrian Center -- A full-service first class equestrian center northeast of Atlanta, Georgia in Gwinnett county