T'TsTu
- Tuana'i, Upolu, Samoa
- Tucson, Arizona, USA
- Tuensang, Nagaland, India
- Tuksuk River, Alaska, USA
- Tuktoyaktuk, Northwest Territories, Canada
- Tulal IP Reservation, Snohomish County, Washington, USA
- Tulalip, Washington, USA
- Tulalip Reservation, Snohomish County, Washington, USA
- Tulangi, Lau, Fiji
- Tunga, Ica, Peru
- Tungurahua, Ecuador
- Tunis, Tunisia
- Tunisia
- Turkey
- Turkmenistan
- Turnour Island, British Columbia, Canada
- Turtle Head, Canada, British Columbia, Canada
- Tuscany, Italy
- Tuvalu
- Tuxekan, Prince of Wales Island, Alaska, USA
TyTzU.UbUcUdUeUg
- Ugadugaru, Mopti, Mali
- Ugaiushak Island, Alaska, USA
- Uganda
- Ugashik, Alaska, USA
- Ugashik, Bristol Bay, Lake And Peninsula, Alaska, USA
- Ugava Bay, Quebec, Canada
- Ugutu, New Georgia, Solomon Islands
Ui
- Uiaku, Oro, Papua New Guinea
UjUkUlUmUn
- Unalakleet, Alaska, USA
- Unalaska, Alaska, USA
- Unalaska, Aleutian Islands, Alaska, USA
- Unalaska, Unalaska Island, Alaska, USA
- Unalaska, Unalaska Island, Aleutian Islands, Alaska, USA
- Unalaska Island, Alaska, USA
- Unalaska Island, Aleutian Islands, Alaska, USA
- Unalaska Island, Fox Islands, Aleutian Islands, Aleutians West, Alaska state, USA
- Underwood Community, possibly, USA
- Ungava Bay, Canada
- Ungava Bay, Labrador, Canada
- Ungava peninsula, Québec province, Canada
- Unidentified, Saudi Arabia
- Union Bar Site, British Columbia, Canada
- Union Bay, British Columbia, Canada
- United Kingdom
- Unknown, Peru
- Unknown State, USA
Up
- Upernivik, Greenland
- Upolu, Samoa
- Upper, Ntlak.Apamux, Ntlakyapamux, British Columbia, Canada
- Upper Auke, Juneau Borough, Alaska, USA
- Upper Auke Vicinity, Juneau Borough, Alaska, USA
- Upper Canada, Canada
- Upper Chilkat River, Haines Borough, Alaska, USA
- Upper Colville River, Icy Cape, North Slope Borough, Alaska, USA
- Upper Colville River, North Slope Borough, Alaska, USA
- Upper Harrison River, British Columbia, Canada
- Upper Ica Valley, Peru
- Upper Ica Valley Peru, Peru
- Upper Kuskokwim, Alaska, USA
- Upper Lake, California, USA
- Upper Missouri, Missouri, USA
- Upper Missouri, USA
- Upper Sachutue River, Cook Inlet, Kenai Peninsula Borough, Alaska, USA
- Upper Sardis Reserve, Sardis, British Columbia, Canada
- Upper Skeena, British Columbia, Canada
- Upper Skeena River, Alaska, USA
- Upper Skeena River, British Columbia, Canada
- Upper Stikine River, Alaska, USA