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Rank | Population | City | Alternative city name(s) | Country |
| 2,681 | U | | Micronesia |
| 174,156 | Ube | | Japan |
| 33,678 | Úbeda | | Spain |
| 265,417 | Uberaba | | Brazil |
635 | 554,664 | Uberlândia | | Brazil |
| 110,746 | Ubon Ratchathani | | Thailand |
| 38,293 | Ucaly | | Russia |
| 75,573 | Uccle | Ukkel | Belgium |
| 105,522 | Uchta | | Russia |
| 425,649 | Udaipur | | India |
| 50,052 | Uddevalla | | Sweden |
| 40,710 | Uden | | Netherlands |
| 101,773 | Udgir | | India |
| 99,035 | Udhagamandalam | | India |
| 62,604 | Udhampur | | India |
| 93,955 | Udine | | Italy |
| 119,466 | Udipi | Udupi | India |
| 32,161 | Udoml'a | | Russia |
| 367,908 | Udon Thani | | Thailand |
| 62,241 | Udumalaipettai | | India |
294 | 1,052,238 | Ufa | | Russia |
| 55,356 | Uga | | Nigeria |
| 186,289 | Ugep | | Nigeria |
| 74,926 | Ughelli | | Nigeria |
| 38,222 | Uglic | | Russia |
| 26,270 | Uherské Hradite | | Czech Republic |
| 27,273 | Uithoorn | | Netherlands |
| 142,717 | Uiwang | Uiwang | South Korea |
| 53,946 | Ujhani | | India |
| 194,521 | Uji | | Japan |
773 | 459,212 | Ujjain | | India |
246 | 1,200,116 | Ujungpandang | | Indonesia |
| 28,235 | Ukmerge | | Lithuania |
348 | 907,802 | Ulaanbaatar | Ulan-Bator | Mongolia |
| 26,889 | Ulaangom | | Mongolia |
| 366,451 | Ulan-Ude | | Russia |
| 12,394 | Ulcinj | | Montenegro |
680 | 520,191 | Ulhasnagar | | India |
| 26,015 | Uliastaj | | Mongolia |
| 1,993 | Uliga | | Marshall Islands |
| 121,357 | Ulm | | Germany |
| 23,528 | Ulonguè | | Mozambique |
| 22,297 | Ulricehamn | | Sweden |
272 | 1,108,279 | Ulsan | | South Korea |
| 115,541 | Ulu Kelang | | Malaysia |
| 223,704 | Ulubaria | | India |
| 3,468 | Uman | | Micronesia |
| 88,190 | Uman' | | Ukraine |
| 873 | Umanak | Uummannaq | Greenland |
| 109,180 | Umeċ | | Sweden |
| 40,848 | Umm al Fahm | Umm el Fahm | Israel |
| 40,629 | Umm al-Qaywayn | | United Arab Emirates |
| 34,079 | Umm Lajj | | Saudi Arabia |
| 25,212 | Umm Qusayr & Al Muqabalayn | | Jordan |
| 71,024 | Umtata | | South Africa |
| 203,421 | Umuahia | | Nigeria |
| 57,081 | Una | | India |
| 122,468 | 'Unayzah | | Saudi Arabia |
| 29,332 | Uneca | | Russia |
| 54,979 | Ungaran | | Indonesia |
| 40,325 | Ungheni | | Moldova |
| 26,185 | Union de Reyes | | Cuba |
| 55,015 | Unjha | | India |
| 35,119 | Unley | | Australia |
| 73,106 | Unna | | Germany |
| 162,583 | Unnao | | India |
| 72,860 | Ünye | | Turkey |
| 60,795 | Uong Bi | | Vietnam |
| 62,073 | Upata | | Venezuela |
| 1,258 | Upernavik | | Greenland |
| 53,652 | Upington | | South Africa |
| 56,757 | Upleta | | India |
| 140,404 | Uppal Kalan | | India |
| 35,989 | Upper Hutt | | New Zealand |
| 21,370 | Upplands-Bro | | Sweden |
| 38,002 | Upplands-Väsby | | Sweden |
| 182,767 | Uppsala | | Sweden |
| 41,502 | Uraj | | Russia |
| 61,646 | Uran-Islampur | | India |
686 | 516,228 | Urawa | | Japan |
| 146,615 | Urgenc | Urgench | Uzbekistan |
| 42,190 | Urjupinsk | | Russia |
| 42,450 | Urla | | Turkey |
| 40,484 | Urmston | | England |
| 101,690 | Uromi | | Nigeria |
| 262,817 | Uruapan del Progreso | | Mexico |
| 124,352 | Uruguaiana | | Brazil |
191 | 1,438,031 | Urumqi | Wulumuqi | China |
| 41,279 | Urus-Martan | | Russia |
| 155,889 | Usak | | Turkey |
| 55,763 | Ushuaia | | Argentina |
| 50,016 | Usinsk | | Russia |
| 89,288 | Usolje-Sibirskoje | | Russia |
| 159,048 | Ussurijsk | | Russia |
| 34,825 | Ust'-Deguta | | Russia |
| 29,236 | Uster | | Switzerland |
| 105,324 | Ust'-Ilimsk | | Russia |
| 26,217 | Ust'-Katav | | Russia |
| 50,314 | Ust'-Kut | | Russia |
| 44,315 | Ust'-Labinsk | | Russia |
| 45,854 | Usulután | | El Salvador |
| 33,674 | Utena | | Lithuania |
| 269,853 | Utrecht | | Netherlands |
| 45,815 | Utrera | | Spain |
791 | 451,219 | Utsunomiya | | Japan |
| 174,755 | Uttarpara-Kotrung | | India |
| 9,615 | Utuado | | Puerto Rico |
| 742 | Utufoa | | Wallis and Futuna |
| 29,617 | Uvarovo | | Russia |
| 58,580 | Uwayl | | Sudan |
| 80,680 | Uyo | | Nigeria |
| 29,673 | Uyown | | Kuwait |
| 10,919 | Uyuni | | Bolivia |
| 46,319 | Uzgen | | Kyrgyzstan |
| 121,999 | Uzhhorod | | Ukraine |
| 59,377 | Uzlovaja | | Russia |
| 38,311 | Üzümlü | | Turkey |
| 36,773 | Uzunköprü | | Turkey |
| 12,197 | Uzwil | | Switzerland |
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