Rivers and Trails Conservation Assistance Program
- National Park Service project provides technical assistance to community groups and government agencies in conserving rivers, preserving open space, and developing trails and greenways.
- http://www.nps.gov/rtca/

American Volkssport Association
- A network of 350 walking clubs. Provides a directory of the clubs and walking events. Includes articles and membership information. Based in Universal City, Texas.
- http://www.ava.org/

Rail- to-Trails Conservancy
- Nonprofit organization that converts abandoned railroad tracks into hiking, walking, and biking trails. Includes bookstore and gift shop items, a history, a database of trails, forums and membership details. Based in Washington, DC.
- http://www.railtrails.org/

Rag Tag Rangers
- About a group of cyberhikers that met during the 1995 AOL/ATC/Backpacker AT Tag Team Relay Hike, their adventures since that time and future events.
- http://www.ragtag.org/

Lewis and Clark Trail Heritage Foundation
- Mission is to honor the historic legacy of Lewis and Clark through research, education, preservation, and promotion. Explore the 3,700 mile Lewis and Clark National Historic Trail from Wood River, Illinois, to Fort Clatsop, Oregon.
- http://www.lewisandclark.org/

Wilderness Volunteers
- The volunteers are a nonprofit organization created to promote service projects in cooperation with public land agencies including the National Park Service, the National Forest Service, the Bureau of Land Management, and the US Fish and Wildlife Service.
- http://www.wildernessvolunteers.org/

Interstate Hiking Club
- A southern New York-northern New Jersey regional hiking club offering weekly hikes. Includes calendar of events and membership information.
- http://www.mindspring.com/~interstatehiking/

Pacific Crest Trail Association
- Provides information about the PCT and the John Muir Trail. Includes trail conditions, descriptions of the five sections, and photo gallery.
- http://www.pcta.org/

New York - New Jersey Trail Conference
- A federation of more than 85 hiking and environmental organizations and over 10,000 individuals dedicated to building and maintaining marked hiking trails and protecting the related openspace in the bi-state region.
- http://www.nynjtc.org/

Highpointer Club
- Mission is to promote climbing to the highest point in each of the fifty states and aid in the preservation and conservation of the highpoints. Includes events calendar and forum.
- http://www.highpointers.org/

North Country Trail Association
- Organization helps build, promote, and protect this national scenic trail which spans seven states. Includes trail descriptions and conditions.
- http://www.northcountrytrail.org/

Potomac Appalachian Trail Club
- A volunteer trails organization which helps to maintain and improve trails, shelters, and cabins in Virginia, Maryland, West Virginia, Pennsylvania, and Washington, DC. Includes club history, hiking tips, and trip reports.
- http://www.patc.net/

Appalachian Long Distance Hikers Association
- Association of hikers who have shared experiences on the Appalachian Trail. Club members get together every fall.
- http://www.aldha.org/

American Trails
- Nonprofit organization works to enhance and protect America's network of interconnected trails. Includes action alerts, events calendar, and database of trails and related groups. Based in California.
- http://www.americantrails.org/

Appalachian Trail Conference
- ATC is a non-profit membership organization whose volunteers and club affiliates protect and maintain the Appalachian Trail, a 2160-mile footpath that extends from Maine to Georgia. Provides up-to-date information on trail conditions, volunteer opportunit
- http://www.appalachiantrail.org/