Nearby Letterboxes
Note that distance is dependent on the accuracy of each clue, typically city center.
(603 listings)
| Letterbox name | Found date | Clue owner | Location | County | Distance | |
|---|---|---|---|---|---|---|
| Go to the Fault-MISSING Missing: Feb 6, 2016 | — | Adoptable Planted: Nov 6, 2004 | Millbrae, CA | San Mateo | 0 | |
| Where's Waldo? Attempted: Aug 11, 2008 | — | Adoptable Planted: Aug 10, 2004 | Millbrae, CA | San Mateo | 0 | |
| Hangman Game 10 Found: Oct 4, 2018 | — | Silver Eagle Planted: Nov 2, 2010 | Millbrae, CA | San Mateo | 0 | |
| What Is It? (letterbox/geocache hybrid) Attempted: Aug 12, 2018 | — | Adoptable Planted: Sep 4, 2013 | The It's It Factory Burlingame, CA | San Mateo | 1.1 | |
| SFO Attempted: Nov 1, 2010 | — | Adoptable Planted: Dec 31, 2004 | Burlingame, CA | San Mateo | 1.5 | |
| 4-11-44 Traveler OK: Dec 11, 2011 | — | Adoptable Planted: Jul 27, 2011 | Hillsborough, CA | San Mateo | 1.7 | |
| Crossroads Attempted: Jun 29, 2013 | — | Adoptable Planted: Oct 17, 2006 | Hillsborough, CA | San Mateo | 1.7 | |
| Jepson Laurel Attempted: Oct 4, 2018 | — | Adoptable Planted: Dec 17, 2006 | Hillsborough, CA | San Mateo | 1.7 | |
| Siempre Adelante- Retired: May 22, 2016 | — | Adoptable Planted: Oct 15, 2004 | Hillsborough, CA | San Mateo | 1.7 | |
| Harry Potter Horcrux 6 Found: Aug 12, 2018 | — | Adoptable Planted: Jan 1, 2012 | Privet Drive Hillsborough, CA | San Mateo | 2.3 | |
| Sweeney Ridge Attempted: Oct 2, 2018 | — | Adoptable Planted: Nov 16, 2008 | San Bruno, CA | San Mateo | 2.6 | |
| Hangman Game 12 Found: Oct 2, 2018 | — | Silver Eagle Planted: Nov 1, 2010 | San Bruno, CA | San Mateo | 2.6 | |
| Bay Front Path Attempted: Jul 8, 2006 | — | Adoptable Planted: Jun 22, 2006 | Foster City/ Burlingame, CA | San Mateo | 3 | |
| aMAZEing Found: Mar 18, 2009 | — | Adoptable Planted: May 1, 2008 | South San Francisco, CA | San Mateo | 4 | |
| Born in the USA Attempted: Jan 24, 2014 | — | Adoptable Planted: Jul 12, 2010 | San Mateo, CA | San Mateo | 4.1 | |
| Get to the Point Attempted: Sep 6, 2010 | — | Adoptable Planted: May 1, 2004 | San Mateo, CA | San Mateo | 4.1 | |
| In The Hollow Found: Oct 15, 2015 | — | look for more trains Planted: Sep 14, 2006 | San Mateo, CA | San Mateo | 4.1 | |
| San Mateo Public Library | — | Adoptable Planted: Dec 4, 2006 | San Mateo, CA | San Mateo | 4.1 | |
| Shopaholic Found: Aug 6, 2009 | — | Adoptable Planted: Jul 29, 2009 | San Mateo, CA | San Mateo | 4.1 | |
| Windy Weather Retired: Mar 30, 2016 | — | Adoptable Planted: Sep 14, 2009 | San Mateo, CA | San Mateo | 4.1 | |
| beresford park - no longer active Retired: Jan 4, 2021 | — | look for more trains Planted: Sep 2, 2006 | San Mateo, CA | San Mateo | 4.2 | |
| Portola "Discovery" Site Attempted: Oct 2, 2018 | — | Adoptable Planted: Nov 6, 2011 | Sweeney Ridge National Park Pacifica, CA | San Mateo | 4.2 | |
| Gear up on Mushrooms! Found: Jun 16, 2017 | — | Adoptable Planted: Dec 31, 2012 | SSF Centennial Trail South San Francisco, CA | San Mateo | 4.4 | |
| Troop 61736 Attempted: Mar 24, 2017 | — | Adoptable Planted: Mar 1, 2017 | Sunnybrae San Mateo, CA | San Mateo | 4.8 | |
| GOING MUSICAL IN SAN MATEO Attempted: Jul 8, 2007 | — | Adoptable Planted: May 5, 2007 | San Mateo-North Shoreview area, CA | San Mateo | 5 | |
| SCOUTING AROUND IN SAN MATEO Attempted: Jul 8, 2007 | — | Adoptable Planted: May 5, 2007 | San Mateo- North Shoreview area, CA | San Mateo | 5 | |
| SOMETHING FISHY IN SAN MATEO Attempted: Jul 8, 2007 | — | Adoptable Planted: May 5, 2007 | San Mateo- North Shoreview Area, CA | San Mateo | 5 | |
| YPS - Yam Postal Service Found: Mar 26, 2017 | — | Adoptable Planted: Apr 12, 2015 | N 37 40.143 W 122 24.930 South San Francisco, CA | San Mateo | 5.1 | |
| Hangman Game 9 Found: Sep 12, 2015 | — | Silver Eagle Planted: Nov 1, 2010 | Pacifica, CA | San Mateo | 5.6 | |
| Grandma Lita Found: Dec 29, 2007 | — | Adoptable Planted: May 11, 2007 | Pacifica, CA | San Mateo | 5.6 | |
| Harold and Maude #1 (Sarah's Babybox) Attempted: Jun 8, 2008 | — | Adoptable Planted: Sep 10, 2005 | Pacifica, CA | San Mateo | 5.6 | |
| These boots are made for hiking Attempted: Aug 11, 2016 | — | Adoptable Planted: Jul 25, 2010 | Pacifica, CA | San Mateo | 5.6 | |
| Upside Down Tree Letterbox Found: Aug 3, 2013 | — | Adoptable Planted: Apr 15, 2008 | Pacifica, CA | San Mateo | 5.6 | |
| Darcy Farrow Found: Apr 22, 2016 | — | Adoptable Planted: Feb 27, 2009 | Brisbane, CA | San Mateo | 5.7 | |
| Laurie's Playground -- MISSING 7-21-07 Missing: Feb 6, 2016 | — | Adoptable Planted: Jul 4, 2007 | South San Mateo, CA | San Mateo | 6 | |
| Macy's Delight Found: Apr 18, 2016 | — | Adoptable Planted: Apr 3, 2016 | Peralta, past Rosita Pacifica, CA | San Mateo | 6.2 | |
| Poopy in Pacifica Retired: Apr 24, 2017 | — | Adoptable Planted: Jul 18, 2009 | Fairmont Park Pacifica, CA | San Mateo | 6.6 | |
| Peep-Squeek Retired: Apr 24, 2017 | — | Adoptable Planted: Jul 7, 2009 | Colma, CA | San Mateo | 6.6 | |
| Wetlands Hurray! Found: Jun 30, 2008 | — | Adoptable Planted: Sep 23, 2004 | Foster City, CA | San Mateo | 6.9 | |
| Audio Drama - Dinotopia Retired: Feb 7, 2016 | — | Nature Hikers Planted: Jul 13, 2013 | Casanova Park San Mateo, CA | San Mateo | 7.3 | |
| Bay shore Roundhouse | — | Schpug Family Planted: Sep 6, 2015 | 2800 Bayshore Blvd Brisbane, CA | San Mateo | 7.4 | |
| Fish Out Of Water Attempted: Jul 8, 2007 | — | Adoptable Planted: Jul 8, 2004 | Daly City, CA | San Mateo | 7.7 | |
| The Frolicking Place (No Clues) Found: Jul 4, 2009 | — | Adoptable Planted: Oct 24, 2004 | Daly City, CA | San Mateo | 7.7 | |
| toxophile Attempted: Oct 14, 2007 | — | Adoptable Planted: Mar 16, 2007 | daly city, CA | San Mateo | 7.7 | |
| Point Montara Found: May 16, 2016 | — | Adoptable Planted: Dec 10, 2008 | Montara, CA | San Mateo | 8.1 | |
| Harry Potter (Book 2) (4) Found 4: Apr 27, 2020 | — | Nature Hikers Planted: May 24, 2016 | Hidden Canyon Park Belmont, CA | San Mateo | 8.1 | |
| Dead Men Tell No Tales Attempted: Aug 31, 2014 | — | Adoptable Planted: Jun 26, 2012 | Twin Pines Park Belmont, CA | San Mateo | 8.2 | |
| Pagurus, the tidepool entertainer Attempted: Jul 28, 2011 | — | Adoptable Planted: Jan 15, 2005 | Moss Beach, CA | San Mateo | 8.5 | |
| Sea Elephant Found: Apr 27, 2014 | — | Silver Eagle Planted: Mar 14, 2010 | Moss Beach, CA | San Mateo | 8.5 | |
| Brownie Troop #62376 Attempted: Jul 7, 2017 | — | Adoptable Planted: May 16, 2016 | Fitzgerald Marine Reserve Moss Beach, CA | San Mateo | 8.8 | |
| This Way to The Egress (Microbox) Missing: Mar 30, 2016 | — | Adoptable Planted: Mar 17, 2006 | Redwood Shores, CA | San Mateo | 8.8 | |
| Eaton Park: Stumped Found: Jun 10, 2015 | — | Adoptable Planted: Apr 3, 2010 | San Carlos, CA | San Mateo | 9.4 | |
| Running Rampant Found: Jan 27, 2010 | — | Adoptable Planted: Jan 4, 2010 | San Carlos, CA | San Mateo | 9.4 | |
| San Carlos Pine Found: Jun 26, 2009 | — | Adoptable Planted: Feb 1, 2008 | San Carlos, CA | San Mateo | 9.4 | |
| "H"is for HILLER Aviation Museum Attempted: Aug 31, 2014 | — | Adoptable Planted: Jun 16, 2012 | HILLER Aviation Museum, 601 Skyway Road San Carlos, CA | San Mateo | 9.4 | |
| Ladies' Little Letterbox Found: Aug 18, 2015 | — | Adoptable Planted: Jun 9, 2015 | San Carlos, CA | San Mateo | 9.4 | |
| Elizabeth & Darcy Found: Jan 1, 2023 | — | Nature Hikers Planted: Aug 18, 2013 | Half Moon Bay, CA | San Mateo | 9.6 | |
| Banana Slug City & Ladybug Jamboree (2) Found 2: Dec 10, 2008 | — | Adoptable Planted: Dec 25, 2004 | Half Moon Bay, CA | San Mateo | 9.6 | |
| Coastside Trail Series-reported missing 7/07 (2) Missing 2: Feb 6, 2016 | — | Adoptable Planted: Nov 27, 2004 | Half Moon Bay, CA | San Mateo | 9.6 | |
| Cowell Ranch Beach Found: Dec 11, 2008 | — | TimberToo Planted: Jun 6, 2007 | Half Moon Bay, CA | San Mateo | 9.6 | |
| In memory of My Dad Missing: Mar 30, 2016 | — | Adoptable Planted: Nov 13, 2011 | Skylawn Memorial Park San Mateo on the way to Half Moon Bay, CA | San Mateo | 9.6 | |
| Jumble Game 18 Attempted: Jan 28, 2024 | — | Silver Eagle Planted: Jul 28, 2011 | Half Moon Bay, CA | San Mateo | 9.6 | |
| Picnic at the Beach Retired: Mar 30, 2016 | — | Adoptable Planted: Jul 19, 2008 | Half Moon Bay, CA | San Mateo | 9.6 | |
| Pigeon Point Lighthouse Attempted: Mar 14, 2008 | — | Adoptable Planted: Mar 12, 2003 | Half Moon Bay, CA | San Mateo | 9.6 | |
| Big Canyon: 4 Boxes by Girl Scouts (4) Found 2: Dec 16, 2013 | — | Adoptable Planted: Apr 21, 2013 | Big Canyon Park San Carlos, CA | San Mateo | 9.7 | |
| Ship Shape Shifting Time (2) Found 2: Sep 24, 2013 | — | Adoptable Planted: Sep 4, 2013 | Indiana Street & Tulare Street San Francisco, CA | San Francisco | 10.3 | |
| Gishwshes- Butter'N'eggish Attempted: Mar 30, 2019 | — | Adoptable Planted: Aug 10, 2017 | Stern Grove San Francisco, CA | San Francisco | 10.6 | |
| It's All About The Benjamins (letterbox/geocache h Found: Dec 30, 2014 | — | Adoptable Planted: Sep 4, 2013 | Ben Franks No 2 Redwood City, CA | San Mateo | 11 | |
| Duck, Duck, Goose Found: Oct 23, 2023 | — | Nature Hikers Planted: Jun 6, 2019 | Redwood City, CA | San Mateo | 11.4 | |
| "Pura Vida" Attempted: May 14, 2013 | — | Adoptable Planted: Dec 7, 2008 | Redwood City, CA | San Mateo | 11.4 | |
| Deep Diver Attempted: Dec 30, 2014 | — | Adoptable Planted: Dec 26, 2008 | Redwood City, CA | San Mateo | 11.4 | |
| It's Your Day!---CURRENTLY MIA! Found: Aug 14, 2008 | — | Adoptable Planted: Jul 9, 2008 | Redwood City, CA | San Mateo | 11.4 | |
| Let's Go Frogging! Missing: Mar 30, 2016 | — | Adoptable Planted: Mar 25, 2007 | Redwood City, CA | San Mateo | 11.4 | |
| Perspicacious Pelican Retired: Apr 28, 2017 | — | Adoptable Planted: Dec 26, 2008 | Redwood City, CA | San Mateo | 11.4 | |
| Harry Potter (Book 3) (5) Found 5: May 19, 2021 | — | Nature Hikers Planted: Jul 4, 2017 | Purisima Creek Redwoods Open Space Preserve Redwood Park, CA | San Mateo | 11.5 | |
| Into the Woods: Cole Valley Attempted: Mar 24, 2021 | — | Daisy Dogs Planted: Aug 18, 2016 | Cole Valley, Sutro Forest San Francisco, CA | San Francisco | 11.6 | |
| GISHWHES 2017 - ThePizzamanCometh Found: Aug 28, 2017 | — | Adoptable Planted: Aug 7, 2017 | Koret Quad San Francisco, CA | San Francisco | 11.7 | |
| Corona Dog Box Found: Jul 14, 2015 | — | Schpug Family Planted: Jun 14, 2015 | Corona Heights Park San Francisco, CA | San Francisco | 11.9 | |
| Hidden Garden Steps OK: Sep 5, 2020 | — | ZooMom Planted: May 27, 2018 | Kirkham St. &; 16th Ave., ///wooden.ties.busy San Francisco, CA | San Francisco | 11.9 | |
| Under the Oak Tree OK: Jul 9, 2008 | — | Adoptable Planted: Jun 24, 2007 | San Jose Family Camp, CA | Tuolumne | 12 | |
| Amazing Fantasy Found: Sep 24, 2013 | — | Adoptable Planted: Sep 4, 2013 | Inner Sunset San Francisco, CA | San Francisco | 12.1 | |
| Quilt Sampler (9) Found 9: Nov 21, 2015 | — | Nature Hikers Planted: Nov 15, 2015 | Purisima Redwood Creek Open Space Preserve Redwood Park, CA | San Mateo | 12.1 | |
| SFO airport Found: Nov 30, 2017 | — | Creeping Death Planted: Nov 28, 2017 | Market St San Francisco, CA | San Francisco | 12.2 | |
| "Incensed" at the Playground Attempted: Mar 24, 2008 | — | Adoptable Planted: Aug 28, 2005 | San Francisco, CA | San Francisco | 12.3 | |
| "T" it UP (missing!) Retired: Aug 3, 2020 | — | Doublesaj & Old Blue Planted: Jul 31, 2004 | San Francisco, CA | San Francisco | 12.3 | |
| Attack of the microwave tarantula Retired: Mar 30, 2016 | — | Adoptable Planted: May 20, 2008 | San Francisco, CA | San Francisco | 12.3 | |
| Auspicious Found 1: Aug 4, 2013 | — | Adoptable Planted: Aug 8, 2008 | San Francisco, CA | San Francisco | 12.3 | |
| B in the City Found: May 12, 2010 | — | Adoptable Planted: May 25, 2010 | San Francisco, CA | Marin | 12.3 | |
| Bank of the West Quest Retired: Apr 25, 2017 | — | Adoptable Planted: May 24, 2008 | San Francisco, CA | San Francisco | 12.3 | |
| Be a Hippy! Attempted: Apr 22, 2014 | — | Cellissimo Planted: Sep 17, 2006 | San Francisco, CA | San Francisco | 12.3 | |
| Ben's Box Attempted: Jul 23, 2007 | — | mizscarlet Planted: Feb 19, 2007 | San Francisco, CA | San Francisco | 12.3 | |
| Boreas, the North Wind MISSING Found: Nov 16, 2005 | — | Adoptable Planted: Nov 3, 2005 | San Francisco, CA | San Francisco | 12.3 | |
| Cabinet of Curiosities: Ammonitida Found: Jan 16, 2011 | — | Adoptable Planted: Aug 6, 2007 | San Francisco, CA | San Francisco | 12.3 | |
| Cabinet of Curiosities: Avian Airship Found: Aug 5, 2013 | — | Adoptable Planted: Dec 8, 2007 | San Francisco, CA | San Francisco | 12.3 | |
| Cabinet of Curiosities: Chelonia Found: Jan 16, 2011 | — | Adoptable Planted: Nov 20, 2007 | San Francisco, CA | San Francisco | 12.3 | |
| Cabinet of Curiosities: Nudibranchia Found: Aug 18, 2017 | — | Adoptable Planted: Aug 17, 2007 | San Francisco, CA | San Francisco | 12.3 | |
| Cabinet of Curiosities: Raphus cucullatus Found: Mar 12, 2010 | — | Adoptable Planted: Nov 22, 2007 | San Francisco, CA | San Francisco | 12.3 | |
| Cat and Mouse - Missing Found: Feb 26, 2006 | — | Adoptable Planted: Oct 3, 2005 | San Francisco, CA | San Francisco | 12.3 | |
| Civil War Cannon Retired: Jul 12, 2011 | — | Happy Drifters Planted: May 29, 2011 | San Francisco, CA | San Francisco | 12.3 | |
| Dia de los Muertos or Day of the Dead Found: Apr 5, 2013 | — | Adoptable Planted: Oct 19, 2005 | San Francisco, CA | San Francisco | 12.3 |