| Abbreviation | Definition |
|---|---|
| UOL | Bugil, Indonesia |
| UON | Muong Sai, Laos |
| UOOO | Norilsk, Russia |
| UOS | Sewanee, Tennessee USA |
| UOTT | Turukhansk, Russia |
| UOX | University Airport, Oxford, Mississippi USA |
| UPA | Punta Alegre, Cuba |
| UPF | Pforheim, Germany |
| UPG | Ujung Pandang, Indonesia |
| UPL | Upala, Costa Rica |
| UPN | Uruapan, Mexico |
| UPP | Upolu Point, Hawaii Island, Hawaii USA |
| UPR | Upiara, Papua New Guinea |
| UQE | Queen, Alaska USA |
| URA | Uruapanuraisk, Kazakstan |
| URB | Urubupunga, Sao Paulo, Brazil |
| URC | Urumqi, Mainland China |
| URG | Uruguaiana, Rio Grande do Sul, Brazil |
| URJ | Uraj, Russia |
| URKK | Krasnodar-Pashkovsky, Russia |