| Abbreviation | Definition |
|---|---|
| UMMS | Minsk 2, Belarus |
| UMOO | Mogilev, Belarus |
| UMR | Woomera, South Australia, Australia |
| UMRG | Ergli, Russia |
| UMT | Umiat, Alaska USA |
| UMU | Umuarama, PR, Brazil |
| UMY | Sumy, Ukraine |
| UNAA | Abakan, Russia |
| UNBB | Barnaul, Russia |
| UNC | Unguia, Colombia |
| UND | Kunduz, Afghanistan |
| UNE | Qacha's Nek, Lesotho |
| UNEE | Kemerovo, Russia |
| UNG | Kiunga, Papua New Guinea |
| UNI | Union Island, Windward Islands |
| UNIB | Baykit, Russia |
| UNII | Yeniseysk, Russia |
| UNIP | Podkamenaya Tunguska, Russia |
| UNIS | Sovetsky Rudnik, Russia |
| UNIT | Tura, Russia |