Nebraska Letterboxing
- Information about letterboxing in and around Nebraska. Includes clues and logs for local letterboxes, as well as some resources for letterboxing in general.
- http://www.letterboxingne.com/

About.com: Letterboxing and Geocaching Attract Walkers
- Article describing the basics and the factors that motivate people to start letterboxing.
- http://walking.about.com/cs/walksamerica/a/letterboxing.htm

Letterboxing Minnesota
- Includes letterboxing basics and clues for Minnesota letterboxes.
- http://www.littlekeylime.com/letterboxingmn.html

They Live and Breathe Letterboxing
- Abstract of an article by Chris Granstrom, with link to a few references.
- http://www.smithsonianmag.com/issues/1998/april/letterboxing.php

The Gazette: Letterboxing a Hobby of Inky Fingers and Hidden Treasures
- Article on local letterboxing from chain of community newspapers near Washington, DC.
- http://gazette.net/gazette_archive/2003/200328/damascus/news/167006-1.html

Letterboxing Germany
- Clues for Germany and other European countries. Includes photos and tips. [English, German]
- http://www.letterboxing-germany.de/

Oklahoma City Letterboxes by Dennis Williams
- Clues to boxes in Oklahoma City as well as New Mexico, Alabama, and Costa Rica.
- http://david.snu.edu/~dwilliam/geog1113/okcboxes.htm

Stamp-in-the-Box
- A collection of information and clues relating to letterboxing, a hobby that combines hiking, art, orienteering and mystery in a treasure-hunt style activity.
- http://www.stampinthebox.com/

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.
- http://alum.wpi.edu/~p_miner/Letterboxes.html

Urban Letterboxing
- Database of clues to letterboxes in urban locations, primarily in Europe.
- http://spacehijackers.co.uk/letterboxing/

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 the northeastern region of the United States.
- http://www.letterboxing.info/

Chuck's Letterboxing
- Chuck and Molly's letterboxes in Connecticut.
- http://www.chuckstraub.com/Letterboxing/connecticut_letterboxes.htm

Catbead Mischief
- Offering clues for letterboxes in the Syracuse, New York area.
- http://www.catbeadmischief.com/

Buckaroo's Letterboxing
- Clues for boxes she planted in Washington and Massachusetts.
- http://sophia.smith.edu/~rlay/letterboxing.htm

British Columbia Letterboxes
- Introduction, photographs of personal stamps, and clues for boxes planted in southwest British Columbia.
- http://www.ajaster.com/letterboxing/

NeeDeep's State Stamp Letterboxes
- Ambitious family project placing letterboxes in each state, patterned after the US quarters series.
- http://statestamp.blogspot.com/

Massachusetts Letterboxes
- Bonnie and Betsey Sennott offer clues to their boxes in Massachusetts.
- http://users.crocker.com/~bsennott/letterbox.html

Letterboxing Questionnaire
- British university student studying letterboxing for her dissertation asks visitors to answer a few questions on the activity.
- http://homepage.ntlworld.com/chris.donovan10/

The Space Traveler
- Family offers clues for Pennsylvania, New York and other states.
- http://www.enter.net/~space/Pages/Letterboxchart.html

Mark and Sue Pepe
- Couple from Kensington, Connecticut describe activities in eleven states and the island of Aruba.
- http://markandsuepepe.blogspot.com/

Aisling Dart
- Artist from Salem, Massachusetts describes her boxes.
- http://www.aisling.net/lb/MA/salem.htm

Fleur de Lis' Letterboxing Journal
- Weblog about his letterboxing hobby.
- http://fleurdelislb.blogspot.com/

Letterboxers Anonymous
- Forum with clues and discussion topics. Includes helpful hints on methods and supplies.
- http://www.leecomputers.com/letterboxing/

Chowder's Southern California Letterboxes
- Search for boxes in Long Beach, San Bernardino and Lake Arrowhead, California.
- http://home.earthlink.net/~letterboxes

Brett and Penny's Letterboxing Page
- List of their boxes planted, found, and exchanged, primarily in Oregon and the Pacific Northwest.
- http://home.agalis.net/bcostley/Letterbox/

What is Letterboxing?
- Michelle Spalding offers a history of letterboxing in England and the United States with bibliography.
- http://www.gigagraphica.com/Michelle/letrbox.html

New Zealand Letterboxing
- Clues, views, and news including boxes from Team Psychokiwi, Judi, Linton, and the Bunny.
- http://www.psychokiwi.org/letterboxing/nzboxing.htm

NPR : Letterboxing
- Radio host Linda Wertheimer and Thomas Johnston, an enthusiast in Washington, D.C., find a letterbox near the White House. [audio]
- http://www.npr.org/templates/story/story.php?storyId=1832303

Yahoo! Groups: Letterboxing Northeast
- Discussion group for the northeastern US.
- http://groups.yahoo.com/group/LbNE/

Dartmoor Letterboxing
- Includes a forum, image gallery, map of the area, contact details, and the history of the activity.
- http://www.dartmoorletterboxing.org

Atlas Quest Letterboxing
- Trip planning portal offers clue search by country as well as tutorials and premium members services.
- http://www.atlasquest.com/

Fox News: Letterboxing Makes Hiking an Adventure
- Feature story datelined Oakland, New Jersey.
- http://www.foxnews.com/story/0,2933,55367,00.html

History of Dartmoor Letterboxing
- Account first published as "More Dartmoor Letterboxes" by Anne Swinscow in 1986.
- http://dartmoorhistory.blogspot.com/

New England Area Letterboxing Gatherings
- Mark & Sue's blog of letterboxing events in New England.
- http://gatherings.blogspot.com/

First Finds
- Posts first finds submitted by new US letterboxers, organized by state.
- http://firstfinds.blogspot.com/

I-95 Letterboxes
- Clues to quick and easy letterboxes to find while traveling on Route I-95, from Maine to Florida.
- http://i95boxing.blogspot.com/

Perfect Circle Letterboxing Guild
- Family and friends offer clues to letterboxes in New Jersey and Pennsylvania.
- http://www.pcdx.com/pclg/index.htm

Washington Post: Thinking Inside the Box
- Article by Caroline Kettlewell describes her discovery of the activity.
- http://www.washingtonpost.com/ac2/wp-dyn?pagename=article&node=&contentId=A55308-2002Jul11

Yahoo! Groups: Letterboxing USA
- Discussion group for US letterboxers.
- http://groups.yahoo.com/group/letterbox-usa/

Dartmoor Letterboxes
- Introduction, tips and things to avoid, news, survey, and letterbox clues for the Dartmoor area.
- http://www.plympton.info/dartmoor/

Have Feet Will Travel
- Introduction, contact details, and guidelines for letterboxing in the Dartmoor area.
- http://easyweb.easynet.co.uk/~have.feet/boxing/boxing.html