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| Alphabetical | By Popularity | | - American Trails
- National trails advocacy organisation working for the common interests of all trail users. - Arizona Trail Association (ATA)
- Working to build, maintain, and promote the Arizona Trail. - Backcountry Bicycle Trails Club (BBTC)
- Mountain bicycling club hosting trail work events, training classes, recreational rides, and representing mountain bikers to land managers. - Bob Marshall Foundation
- Nonprofit organisation formed to channel donated time and funds for trail maintenance in the Bob Marshall Wilderness Complex of Montana. - Bruce Trail Association
- Dedicated to the development and maintenance of over 800 kilometers of hiking trails on the Niagara Escarpment. - Buckeye Trail Association
- Provides information to help in planning hikes on Ohio's Buckeye Trail and an events calendar. - CNY DIRT: Central New York Dedicated Individuals for Responsible Trail-use
- Dedicated to protecting the mountain bike trails of the greater Syracuse area. - Coastwalk
- Promotes coastal conservation and the completion of the California Coastal Trail by conducting 4 to 6 day camping hiking trips in 15 counties. - Continental Divide Trail Alliance
- Nonprofit organisation dedicated to promoting, improving, and facilitating use of the Continental Divide Trail, along the spine of the Rockies. - Continental Divide Trail Society
- Promotes development and management of the Continental Divide National Scenic Trail as a quiet nonmotorized trail. - East Coast Greenway Alliance
- Promoting a 2,500 mile traffic-free path linking East Coast cities from Maine to Florida - an urban alternative to the Appalachian Trail. - Finger Lakes Trail Conference
- Mission is to build, protect, and enhance a continuous footpath across New York State. - Florida Trail Association (FTA)@
- Friends of Stevens Creek Trail
- Local nonprofit group dedicated to raising community awareness and support to complete the trail all the way from SF Bay to the mountains and trail links to the Pacific Ocean. - Friends of the Pumpkinvine Nature Trail
- Proposed hiking-biking trail on the abandoned Pumpkinvine railroad corridor, not open to the public at this time. - New York - New Jersey Trail Conference
- Federation dedicated to building and maintaining marked hiking trails and protecting the related open space in the bi-state region. - Newfoundland T'Railway Council
- Nonprofit corporation dedicated to developing a recreational trail from St. John's to Port aux Basques using the former Canadian National railway line. - Oak Ridges Trail Association
- Go hiking from the Bruce Trail in the west to the Ganaraska Trail in the east (north of Toronto, Ontario, Canada). - Ontario Trails Council (OTC)
- Responsible for the development of recreational trails in the province. - Pacific Crest Trail Association
- Protecting, preserving, and promoting the trail for hikers and equestrians. - Pine Mountain Trail Association
- The Pine Mountain Trail crosses the Pine Mountain Ridge, and is used by over 50,000 hikers per year. - Tennessee Trails Association
- An organisation of avid hikers with activities scheduled for most weekends. Contains chapter information, hike schedule, and related links. - Trail Center
 - Trails4All
- Established to assist in coordinating volunteer trail projects and to raise funds to support groups that undertake those projects. - Voyageur Hiking Trail Association
- Nonprofit citizens' group dedicated to developing and maintaining a continuous hiking trail for public use across Northern Ontario. - Washington Trails Association
- Nonprofit membership organisation working to preserve and enhance Washington's trail system. Features extensive trail reports, photos, and advocacy news and events. - Western Trailbuilders Association
- Nonprofit association of professional trail contractors, consultants, and designers.
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