International Appalachian Trail
- Provides information on this trail which runs from Mt. Katahdin in Maine to Cap Gaspe in Quebec. Includes trail descriptions and maps, calendar of events, and membership information.
- http://www.internationalat.org/

Continental Divide Trail Alliance
- Organization committed to completion and continued care of this trail. Includes map, descriptions of trail sections, and membership information.
- http://www.cdtrail.org

ClubTread
- Online hiking community and club for the Pacific Northwest including British Columbia, Alberta, and Washington State. Trail database, discussion forums, event planning, trip reports, and photos.
- http://www.clubtread.com

American Hiking Society
- National nonprofit organization dedicated to promoting hiking and to establishing, protecting and maintaining foot trails in America. Listing of events and more than 130 member trail clubs.
- http://www.americanhiking.org/