U
| Ua Huka (PF) | Ulaangom (MN) | Uray (RU) |
| Ua Pou (PF) | Ulan (CN) | Urganch (UZ) |
| Ube (JP) | Uliastay (MN) | Urmia (IR) |
| Uberaba (BR) | Ulsan (KR) | Uruapan (MX) |
| Uberlandia (BR) | Ul'yanovsk (RU) | Urumqi (CN) |
| Ubon Ratchathani (TH) | Umeå (SE) | Usak (TR) |
| Udaipur (IN) | Umiujaq (CA) | Ushuaia (AR) |
| Udon Thani (TH) | Umtata (ZA) | Usinsk (RU) |
| Ufa (RU) | Unalakleet (US) | Utila (HN) |
| Ujungpandang (ID) | Upernavik (GL) | Uummannaq (GL) |
| Ukhta (RU) | Upington (ZA) | Uzhhorod (UA) |
| Ulaanbaatar (MN) | Uranium City (CA) |