Dartmoor LetterBoxes - Introduction, tips and things to avoid, news, survey, and box clues for the Dartmoor area.
Dartmoor Letterboxes - Personal page with an introduction to letterboxing, terminology, stamp samples, and tips for getting started in the Dartmoor region.
Dartmoor Letterboxing - Brief introduction and history, along with some examples of stamps.
Der Hand-Carved Stamps - Clues for boxes planted in Oregon and several other western states, and instructions on how to carve a stamp.
Dutch Letterbox Site - Personal page describing the Dartmoor 100 Club, clues for personal boxes in the Dartmoor area, and some photographs. [English and Dutch]
Letterboxing Nebraska - Clues and information for letterboxes in and around Nebraska. Operated as a "Wiki", which permits visitors to contribute content.
Letterboxing North America - Instructions for getting started, FAQs, mailing list, and clues for letterboxes in Canada, United States, Bermuda, Mexico, and Central American and Caribbean countries.
Letterboxing Northeast - Articles on eraser art, photographs of people and places, links, and a lengthy list of clues for boxes placed by the Drew family primarily in New England states, but also Washington, DC, South Carolina, and Colorado.
Letter-Boxing.com - Events in Michigan, U.S.A. and a form for suscribing to a mailing list.
Mirkwood's Letterboxing Site - Clues to letterboxes placed by the author throughout Michigan, plus images of the stamps she created for them.
Mischief's Letterboxes - Directory of clues for boxes placed in Washington, suggested items to place in a letterbox, and boxes found.
Oklahoma City Letterboxes - Personal page of Dennis Williams with clues for boxes in and around Oklahoma City, Oklahoma.
Perfect Circle Letterboxing Guild - Group which organizes letterboxing and geocaching expeditions throughout New Jersey. Includes clues for placed boxes and photographs from gatherings.
Ryan's Letterboxes - Personal page with clues for boxes placed throughout the western United States, as well as a few in Canada, Africa, and Central America. Also includes tips for improving the stamp quality.
Silent Doug's Letterboxing Site - Articles including getting started, outdoor ethics, and explanation of cryptic letterboxer codes. Also includes list of boxes found and clues for boxes placed in New York and Pennsylvania.
They Live and Breathe Letterboxing - Abstract of an article by Chris Granstrom, originally published in the April 1998 issue of Smithsonian Magazine.
Thinking Inside the Box - Washington Post article by Caroline Kettlewell which describes her discovery of the activity.
Wanda and Pete's Letterboxes - Clues for boxes placed primarily in Rhode Island, but a few in other states as well. Also includes logs of the movement of hitchhiker boxes, primarily in New England.
What is Letterboxing? - Personal page of Michelle Spalding with brief history and a description of the activity.
Yahoo! Groups : Letterboxing North America - Discussion group intended for "sharing of ideas, stories, tips, news, advice, and clues related to the hobby of Letterboxing."
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