U
| Ua Huka (PF) | Ulanhot (CN) | Uraj (RU) |
| Ua Pou (PF) | Ulan-Ude (RU) | Uranium City SK (CA) |
| Ube (JP) | Ulei (VU) | Urgench (UZ) |
| Uberaba (BR) | Ulgit (MN) | Urmieh (IR) |
| Uberlandia (BR) | Uliastai (MN) | Uruapan (MX) |
| Ubon Ratchathani (TH) | Ulsan (KR) | Urumqi (CN) |
| Udaipur (IN) | Ulyanovsk (RU) | Usak (TR) |
| Udon Thani (TH) | Umea (SE) | Ushuaia (AR) |
| Ufa (RU) | Umiujaq QC QC (CA) | Usinsk (RU) |
| Ujung Pandang (ID) | Umtata (ZA) | Ustupo (PA) |
| Ukhta (RU) | Unalakleet AK (US) | Utapao (TH) |
| Ulaanbaatar (MN) | Upernavik (GL) | Utila (HN) |
| Ulaangom (MN) | Upington (ZA) | Uummannaq (GL) |