| ABT | Alabama Trail, AL |
| ACT | Annapurna Circuit Trail, Nepal |
| ADT | American Discovery Trail, DE-CA |
| ALT | Allegheny Trail, WV |
| AND | Length of the Andes, SA |
| ART | Art Loeb Trail, NC |
| AT | Appalachian Trail, ME-GA |
| ATT | Able-Tasman Track, NZ |
| AZT | Arizona Trail, AZ |
| BAT | Batona Trail, NJ |
| BBT | Big Blue Trail, PA |
| BFT | Black Forest Trail, PA |
| BIB | Bibbulmun Track, Australia |
| BMT | Benton MacKaye Trail, GA |
| BP | Bucktail Path, PA |
| BRT | Bartram Trail, NC |
| BT | Bruce Trail, Canada |
| BUT | Buckeye Trail, OH |
| CAT | Catoctin Trail, MD |
| CCW | Coast-to-Coast Walk, England |
| CDT | Continental Divide Trail, NM-MT |
| CDW | Calderdale Way, England |
| CEN | Centennial Trail, SD |
| CFL | Big 360, FL |
| CHBT | Cape Hatteras Beach Trail, NC |
| CHL | Chilkoot Trail, NA |
| CI | Cumberland Trail, TN |
| CINS | Cumberland Island, GA |
| CKT | Chuck Keiper Trail, PA |
| CLW | Cleveland Way, England |
| CO | C&O Canal Towpath, MD |
| COH | Cohos Trail, NH |
| COL | Colorado Trail, CO |
| COT | Conestoga Trail, PA |
| CP | Crawford Path, NH |
| CRF | Costa Rica Rainforest, Costa Rica |
| CRT | Cross Rivendell Trail, VT-NH |
| CS | El Camino de Santiago, Spain |
| CTC | Coast to Coast, DE-CA |
| CUW | Cumbrian Way, England |
| CW | Cotswold Way, England |
| DHT | Donut Hole Trail, PA |
| DIW | Dingle Way, Ireland |
| DRT | Duncan Ridge Trail, GA |
| DW | Dales Way, England |
| ECST | East Coast Trail, Canada |
| ECT | Eastern Continental Trail, NA |
| ESC | Escalante Canyon, UT |
| ET | Everest Trek, Nepal |
| FHT | Foothills Trail, SC |
| FLT | Finger Lakes Trail, NY |
| FT | Florida Trail, FL |
| GAP | Great Allegheny Passage, MD-PA |
| GC | Grand Canyon, AZ |
| GDT | Great Divide Trail, Canada |
| GEA | Grande Excursion Apenenica, Italy |
| GR10 | Grande Randonnée Pyrenees, France |
| GR11 | Spanish Pyrenees Trail, Spain |
| GR20 | Grande Randonnée Corsica, Corsica |
| GR5 | Grande Route Cinq, Europe |
| GRT | Greenbrier River Trail, WV |
| GSM | Great Smoky Mountains, NC-TN |
| GSWW | Great South West Walk, Australia |
| GT | Greenbelt Trail, NY |
| GTNZ | Greenstone Track, NZ |
| HDT | Hayduke Trail, UT-AZ |
| HST | High Sierra Trail, CA |
| HT | Horseshoe Trail, PA |
| HTNZ | Heaphy Track, NZ |
| HWP | Hadrian's Wall Path, England |
| IATSIA | International A.T., NA |
| ICE | Ice Age Trail, WI |
| IMT | Iron Mountain Trail, TN-VA |
| IR | Isle Royale, MI |
| IT | Inca Trail, Peru |
| JMT | John Muir Trail, CA |
| JPS | John P. Saylor Trail, PA |
| KEK | Kekekabic Trail, MN |
| KILI | Kilimanjaro, Tanzania |
| KT | Knobstone Trail, IN |
| KTY | Katy Trail, MO |
| KW | Kerry Way, Ireland |
| LBL | Land Between the Lakes, KY |
| LCT | Lost Coast Trail, CA |
| LHT | Laurel Highlands, PA |
| LMS | Little Miami Scenic Trail, OH |
| LOST | Lake Okeechobee Scenic Trail, FL |
| LOT | Loyalsock Trail, PA |
| LP | Long Path, NY |
| LT | Long Trail, VT |
| LTT | Lost Turkey Trail, PA |
| MDH | Maah Daah Hey, ND |
| MDT | Mason-Dixon Trail, PA |
| MET | Metacomet Trail, CT |
| MFSR | Middle Fork Salmon River Trail, ID |
| MMT | Metacomet-Monadnock Trail, CT-NH |
| MSG | Monadnock-Sunapee Greenway, NH |
| MSMA | Midstate Trail, MA |
| MSPA | Mid State Trail, PA |
| MSS | Michigan Shore-to-Shore Trail, MI |
| MT | Milford Track, NZ |
| NBT | North Bend Trail, WV |
| NPT | Northville-Placid Trail, NY |
| NRT | New River Trail, VA |
| NST | North-South Trail, RI |
| NT | Natchez Trace, MS-TN |
| OCH | Oil Creek Hiking Trail, PA |
| ODP | Offa's Dike Path, Wales |
| OHT | Ozark Highlands Trail, AR |
| OLP | Old Loggers Path, PA |
| OT | Ocala Trail, FL |
| OTA | Overland Track, Australia |
| OTM | Ozark Trail, MO |
| OUT | Ouachita Trail, AR |
| PCH | Pinchot Trail, PA |
| PCP | Pembrokeshire Coast Path, Wales |
| PCT | Pacific Crest Trail, CA-WA |
| PHR | Pyrenees High Route, Spain |
| PMT | Pine Mountain Trail, GA |
| PNT | Pacific Northwest Trail, WA-MT |
| PRNL | Pictured Rocks National Lakeshore Trail, MI |
| PT | Pinhoti Trail, AL-GA |
| PW | Pennine Way, England |
| QCT | Queen Charlotte Track, New Zealand |
| QT | Quehanna Trail, PA |
| RFT | Robert Frost Trail, MA |
| RT | Routeburn Track, NZ |
| RTR | River to River Trail, IL |
| RW | Ridgeway National Trail, England |
| SCW | St. Cuthbert's Way, Scotland |
| SDW | South Downs Way, England |
| SE | Les Sentiers de L'Estrie, Canada |
| SHKK | Shikoku Pilgrimage, Japan |
| SHR | Sierra High Route, CO |
| SHT | Superior Hiking Trail, MI |
| SKT | South Kaibab Trail, AZ |
| ST | Sheltowee Trace, KY-TN |
| STS | Susquehannock Trail System, PA |
| SUW | Southern Upland Way, Scotland |
| SWCP | S.W. Coast Path, England |
| TAC | Taconic Crest Trail, MA-NY |
| TCT | Teton Crest Trail, WY |
| TLW | The Lycian Way, Turkey |
| TMB | Le Tour du Mont Blanc, Europe |
| TMW | Two Moors Way, England |
| TRA | Trans America, USA |
| TRT | Tahoe Rim Trail, CA-NV |
| TSTS | Thunderswamp Trail System, PA |
| TT | Tuscarora Trail, PA |
| TWT | Warner Trail, MA-RI |
| TYT | Tahoe-Yosemite Trail, CA |
| VIA | Via Alpina Trails, Europe |
| WCT | West Coast Trail, Canada |
| WHW | West Highland Way, Scotland |
| WPT | Wapack Trail, MA-NH |
| WR | West Rim, PA |
| WS | Western States Trail, CA |
| WT | Wonderland Trail, WA |
| WTA | Warrior Trail, PA-WV |
| WUT | Western Uplands Trail, Canada |
| WW | Wicklow Way, Ireland |
| YK | Yukon Trail, Canada |
| YRT | Youghiogheny River Trail, PA |