Приложение D: Коды наименований географических регионов
- T
 
- T.A.A.F.
  - USE     Terres australes et antarctiques francaises
 - Tadzhik Soviet Socialist Republic
 - USE     Tajikistan
 - Taiwan    [a-ch]
 - UF       Formosa
 - Tajik S.S.R.
 - USE     Tajikistan
 - Tajikistan    [a-ta]
 - [Кодировалось [e-ur-ta] (Tajikistan) до июня 1998]
- UF       Tadzhik Soviet Socialist Republic
           Tajik S.S.R.
  - Tanganyika
 - Присвоен код: 
     [f-tz]    Tanzania
 - Tangier (Morocco)
 - Присвоен код: 
     [f-mr]    Morocco
 - Tanzania    [f-tz]
 - UF       German East Africa
 - Tasmania    [u-at-tm]
- Tennessee    [n-us-tn]
- Terres australes et antarctiques francaises
    [i-fs]
   - UF       French Southern and Antarctic Lands
           French Southern Indian Ocean Islands
           Indian Ocean Islands, French
           T.A.A.F.
 - Texas    [n-us-tx]
- Thailand    [a-th]
  - UF       Siam
 - Thailand, Gulf of    [af]
 - UF       Gulf of Thailand
           Siam, Gulf of
 - Thian Shan
 - USE     Tien Shan
 - Third World
 - USE     Developing Countries
 - Tian Shan
 - USE     Tien Shan
 - Tianjin (China)     [a-cc-tn] 
 - UF       Tientsin (China) 
 - Tibesti Mountains
 - Присвоены коды: 
     [f-cd]    Chad
     [f-ly]    Libya
     [f-ng]    Niger
 - Tibet (China)    [a-cc-ti]
 - UF       Tibetan Autonomous Region (China) 
 - Tibetan Autonomous Region (China)
 - USE     Tibet (China)
 - Tien Mountains
 - USE     Tien Shan
 - Tien Shan    [at]
 - UF       Thian Shan
           Tian Shan
           Tien Mountains
 - Tientsin (China)
 - USE     Tianjin (China)
 - Timor, East
 - USE     East Timor
 - Timor, Portuguese
 - USE     East Timor
 - Timor Island
 - Присвоены коды: 
     [a-io]    Indonesia
     [a-em]    East Timor
 - Timor Sea
 - Присвоен код: 
     [i]    Indian Ocean
 - Timor Timur
 - USE     East Timor
 - Tobago
 - Присвоен код: 
     [nwtr]    Trinidad and Tobago
 - Togo    [f-tg]
 - UF       French Togoland
           Togoland (French)
 - Togoland
 - Присвоены коды: 
     [f-gh]    Ghana
     [f-tg]    Togo
 - Togoland (British)
 - Присвоен код: 
     [f-gh]    Ghana
- UF       British Togoland
  - Togoland (French)
 - USE     Togo
 - Tokelau    [potl]
 - UF       Union Islands
 - Tonga    [poto]
 - UF       Friendly Islands
           Tonga Islands
 - Tonga Islands
 - USE     Tonga
 - Torres Strait Islands (Qld.)   
 - Присвоен код: 
     [u-at-qn]    Queensland
 - Transcaucasia
 - [Кодировалось [e-ur-ai] (Armenia (Republic)), [e-ur-aj] (Azerbaijan), [e-ur-gs] (Georgia (Republic)) до июня 1998]
- Присвоены коды: 
     [e-ur-ai]    Armenia (Republic)
     [e-ur-aj]    Azerbaijan
     [e-ur-gs]    Georgia (Republic)
  - Transjordan
 - USE     Jordan
 - Trinidad
 - Присвоен код: 
     [nwtr]    Trinidad and Tobago
 - Trinidad and Tobago    [nwtr]
- Tristan da Cunha    [lstd]
- Trobriand Islands (Papua New Guinea)
   - Присвоен код: 
     [a-pp]    Papua New Guinea
 - Tropics    [w]
- Trucial States
  - USE     United Arab Emirates
 - Truk (Micronesia)
 - USE     Chuk (Micronesia)
 - Trust Territory of the Pacific Islands
 - USE     Pacific Islands (Trust Territory)
 - Tsinghai Province (China)
 - USE     Qinghai Sheng (China) 
 - Tuamotu Archipelago (French Polynesia)
 - Присвоен код: 
     [pofp]    French Polynesia
 - Tubuai Islands
 - USE     Austral Islands (French Polynesia)
 - Tunisia    [f-ti]
- Turkey    [a-tu]
  - UF       Asia Minor
 - Turkmen S.S.R.
 - USE     Turkmenistan
 - Turkmenistan    [a-tk]
 - [Кодировалось [e-ur-tk] (Turkmenistan) до июня 1998]
- UF       Turkmen S.S.R.
  - Turks and Caicos Islands    [nwtc]
 - UF       Caicos Islands
 - Tuvalu    [potv]
 - [Кодировалось [pogn] (Gilbert and Ellice Islands) до марта 1988]
- UF       Ellice Islands
  - U
- U.S.S.R.
  - USE     Soviet Union
 - Ubangi Shari
 - USE     Central African Republic
 - Uganda    [f-ug]
- Ukraine    [e-un]
  - [Кодировалось [e-ur-un] (Ukraine) до июня 1998]
 - Underdeveloped areas
 - USE     Developing countries
 - Union Islands
 - USE     Tokelau
 - Union of South Africa
 - USE     South Africa
 - United Arab Emirates    [a-ts]
 - UF       Trucial States
 - United Arab Republic
 - Присвоен код: 
     [f-ua]    Egypt
     [a-sy]    Syria
 - United Kingdom
 - USE     Great Britain
 - United Kingdom Miscellaneous Islands Dependencies
 - USE     Great Britain Miscellaneous Islands Dependencies
 - United States    [n-us]
- United States Miscellaneous Carribean Islands
    [nwuc]
  - UF       Carribean Islands Dependencies of the United States
           Islands Dependencies of the United States in the Carribean
 - United States Miscellaneous Pacific Islands
    [poup]
 - Включает American Samoa, Guam, Pacific Islands (Trust Territory), рассматриваемые как целое
- UF       Islands Dependencies of the United States in the Pacific
           Pacific Islands Dependencies of the United States
  - Upper Volta
 - USE     Burkina Faso
 - Ural Mountains (Russia)    [e-uru]
- Uruguay    [s-uy]
- Utah    [n-us-ut]
- Uvea Island (Wallis and Futuna Islands)
    - Присвоен код: 
     [powf]    Wallis and Futuna Islands
 - Uzbek S.S.R.
 - USE     Uzbekistan
 - Uzbekistan    [a-uz]
 - [Кодировалось [e-ur-uz] (Uzbekistan) до июня 1998]
- UF       Uzbek S.S.R.