Article describing the basics and the factors that motivate people to start letterboxing.

Artist from Salem, Massachusetts describes her boxes.

Brief article includes details on supplies and features instructions for participation with children.

Trip planning portal offers clue search by country as well as tutorials and premium members services.

List of their boxes planted, found, and exchanged, primarily in Oregon and the Pacific Northwest.

Introduction, photographs of personal stamps, and clues for boxes planted in southwest British Columbia.

Clues for boxes she planted in Washington and Massachusetts.

Offering clues for letterboxes in the Syracuse, New York area.

Search for boxes in Long Beach, San Bernardino and Lake Arrowhead, California.

Chuck and Molly's letterboxes in Connecticut.

Official site supports letterboxing in publicly owned state forests.

Introduction, tips and things to avoid, news, survey, and letterbox clues for the Dartmoor area.

History of the activity, similar to orienteering, begun in 1854 at Cranmere Pool on the moor, and now popular in many countries. Offers a forum and contact information.

Rubber stamp carver Mitch offers instructions on how to carve a stamp, and some examples.

Clues for boxes in Dartmoor and in the Netherlands. [English and Dutch]

Posts first finds submitted by new US letterboxers, organized by state.

Virtual letterbox clues lead visitors on an online hunt.

Weblog about his letterboxing hobby.

Feature story datelined Oakland, New Jersey.

Clues to letterboxes he has placed, mostly in the Northwest US.

Introduction, contact details, and guidelines for letterboxing in the Dartmoor area.

Account first published as "More Dartmoor Letterboxes" by Anne Swinscow in 1986.

Hitchhikers are a form of traveling letterbox. Site includes lists of hitchhikers and last reported letterbox location.

Clues to boxes hidden in Granby, Connecticut.

Clues to quick and easy letterboxes to find while traveling on Route I-95, from Maine to Florida.

Clues for letterboxes located in Kansas.

Forum with clues and discussion topics. Includes helpful hints on methods and supplies.

Introductory information, message board, resources, links to clues, and tips for letterboxing with dogs.

Clues by country and tips for enjoyment.

US-based portal offering FAQ, links, forums, and a members-only section where clues can be submitted.

The Drew family of East Lyme, Connecticut, offer clues in New England states as well as Washington, DC, South Carolina, and Colorado.

British university student studying letterboxing for her dissertation asks visitors to answer a few questions on the activity.

Couple from Kensington, Connecticut describe activities in eleven states and the island of Aruba.

Bonnie and Betsey Sennott offer clues to their boxes in Massachusetts.

Clues to boxes placed by Ruthann Zaroff and her family throughout Michigan, plus images of the stamps she created for them.

Anna and Paul offer clues to boxes in Connecticut, Massachusetts and Vermont.

Information about letterboxing in and around Nebraska. Includes clues and logs for local letterboxes, as well as some resources for letterboxing in general.

Ambitious family project placing letterboxes in each state, patterned after the US quarters series.

Mark & Sue's blog of letterboxing events in New England.

Clues, views, and news including boxes from Team Psychokiwi, Judi, Linton, and the Bunny.

Links to dozens of forums and clue sites.

Radio host Linda Wertheimer and Thomas Johnston, an enthusiast in Washington, D.C., find a letterbox near the White House. [audio]

Clues to boxes in Oklahoma City as well as New Mexico, Alabama, and Costa Rica.

Family and friends offer clues to letterboxes in New Jersey and Pennsylvania.

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.

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.

Clues to nearly 100 letterboxes that Silver Eagle has placed in North America, primarily in Texas.

Abstract of an article by Chris Granstrom, with link to a few references.

A collection of information and clues relating to letterboxing, a hobby that combines hiking, art, orienteering and mystery in a treasure-hunt style activity.

This Englishman from Torquay has written a brief history with a guide to the Tors and some examples of stamps.

Tara Lowry offers clues to her boxes and images of her many hand-carved stamps, with tutorials and links.

Article on local letterboxing from chain of community newspapers near Washington, DC.

Family offers clues for Pennsylvania, New York and other states.

Forums and worldwide clues database.

Clues to letterboxes placed by twograysquirrels, mostly in Maryland and Virginia.

Database of clues to letterboxes in urban locations, primarily in Europe.

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.

Article by Caroline Kettlewell describes her discovery of the activity.

Michelle Spalding offers a history of letterboxing in England and the United States with bibliography.

Discussion group for the northeastern US.

Discussion group for US letterboxers.