| U | ||
| Ube, Japan (UBJ) | Uliastai, Mongolia (ULY) | Uruguaiana, RS, Brazil (URG) |
| Uberaba, MG, Brazil (UBA) | Ulithi, Micronesia (ULI) | Urumqi, China (URC) |
| Uberlandia, MG, Brazil (UDI) | Ulsan, South Korea (USN) | Useless Loop, WA, Australia (USL) |
| Ubon Ratchathani, Thailand (UBP) | Ulundi, South Africa (ULD) | Ushuaia, TF, Argentina (USH) |
| Udaipur, Indonesia (UDR) | Umea, Sweden (UME) | Usinsk, Russia (USK) |
| Udon Thani, Thailand (UTH) | Umtata, South Africa (UTT) | Ust-Kamenogorsk, Kazakhstan (UKK) |
| Ufa, Russia (UFA) | Upernavik, Greenland (JUV) | Ust-Ilimsk, Russia (UIK) |
| Ujae Island, Marshall Islands (UJE) | Upington, South Africa (UTN) | Utapao, Thailand (UTP) |
| Ujung Pandang, Indonesia (UPG) | Uraj, Russia (URJ) | Utila, Honduras (UII) |
| Ukhta, Russia (UCT) | Uralsk, Kazakhstan (URA) | Utirik Island, Marshall Islands (UTK) |
| Ulaanbaatar, Mongolia (ULN) | Urgench, Uzbekistan (UGC) | Uummannaq, Greeland (UMD) |
| Ulanhot, China (HLH) | Urmieh, Iran (OMH) | Uzhgorod, Ukraine (UDJ) |
| Ulan-Ude, Russia (UUD) | Uroubi, Papua New Guinea (URU) | |
| Ulei, Vanuatu (ULB) | Uruapan, Mexico (UPN) |