| U.S.A. to France, in 1918 | 25 |
| U.S.A.'s best customer | 26 |
| U.S.A., Russia, et al. | 22 |
| U.S.A.F. Academy cadet | 22 |
| U.S.A.F. operations center | 26 |
| U.S.–Canada divider | 26 |
| U.S.–Ont. canals | 23 |
| U.S.C. upperclassmen, e.g. | 26 |
| U.S.M.A., to sportswriters | 26 |
| U.S.M.C. barracks boss | 22 |
| U.S.M.C. recruits: Abbr. | 24 |
| U.S.N. "police" | 25 |
| U.S.N. junior officer: Abbr. | 28 |
| U.S.N. policing groups | 22 |
| U.S.N. rank below Capt. | 23 |
| U.S.N. rank under captain | 25 |
| U.S.N. two-star officer | 23 |
| U.S.N.A. grad's rank | 24 |
| U.S.N.A. rank below capt. | 25 |
| U.S.N.A. trainee: Abbr. | 23 |
| U.S.O. show audience members | 28 |
| U.S.O., for one: Abbr. | 22 |
| U.S.P.S. employee's beat | 28 |
| U.S.S. Enterprise command | 25 |
| U.S.S. Enterprise counselor | 27 |
| U.S.S. Enterprise defenses | 26 |
| U.S.S. Enterprise off. | 22 |
| U.S.S. Enterprise officer | 25 |
| U.S.S. Enterprise, e.g. | 23 |
| U.S.S. Hornet, in a way | 23 |
| U.S.S. Nautilus, for one | 24 |
| U.S.S. ___, ship in 2000 news | 29 |
| U.S.S.R. area goes south | 24 |
| U.S.S.R. body of water | 22 |
| U.S.S.R. craft society | 22 |
| U.S.S.R. fugitive, e.g. | 23 |
| U.S.S.R. gold-medal gymnast | 27 |
| U.S.S.R. head: 1917-24 | 22 |
| U.S.S.R. inland body of water | 29 |
| U.S.S.R. livestock market | 25 |
| U.S.S.R. member: Abbr. | 22 |
| U.S.S.R. mining center | 22 |
| U.S.S.R. monetary unit | 22 |
| U.S.S.R. mountain range | 23 |
| U.S.S.R. security group | 23 |
| U.S.S.R. security police | 24 |
| U.S.S.R. water barrier | 22 |
| U.S.S.R.'s Big Ivan, e.g. | 29 |
| U.S.S.R.'s Brezhnev | 23 |
| U.S.S.R.'s location | 23 |
| U.S.S.R.'s Sea of ___ | 25 |
| U.S.S.R.'s successor | 24 |
| U.S.S.R.'s ___ Mountains | 28 |
| U.S.S.R.'s ___ Sea | 22 |
| U.S.S.R., to Muscovites | 23 |
| U.S.S.R.-China border river | 27 |
| U.S.S.R.-China river boundary | 29 |
| U.S.T.A. champ in 1968 | 22 |
| U.S.T.A. singles champ: 1972 | 28 |
| U2 "All I Want ___" | 29 |
| U2 "Bass ___" | 23 |
| U2 "One ___ Hill" | 27 |
| U2 "Pop" single | 25 |
| U2 "Spanish ___" | 26 |
| U2 "The Joshua ___" | 29 |
| U2 "White as ___" | 27 |
| U2 "___ of Harlem" | 28 |
| U2 "___ Your Boots" | 29 |
| U2 bassist, familiarly | 22 |
| U2 singer's journey? | 24 |
| U2 song and Bob Dylan album? | 28 |
| U2's Bono, since 2007 | 25 |
| U2's land, to its natives | 29 |
| U2's lead vocalist | 22 |
| UAL's westernmost hub | 25 |
| UB40 "Two in ___" | 27 |
| UB40 "___ Ten" | 24 |
| Ubiquitous 2003 single | 22 |
| Ubiquitous actor M. ___ Walsh | 29 |
| Ubiquitous auto features | 24 |
| Ubiquitous berry, nowadays | 26 |
| Ubiquitous Celebes beast | 24 |
| Ubiquitous comestibles | 22 |
| Ubiquitous crossword cookie | 27 |
| Ubiquitous lily relative | 24 |
| Ubiquitous Mad Magazine guy | 27 |
| Ubiquitous mall merchant | 24 |
| Ubiquitous medicinal plant | 26 |
| Ubiquitous men's org. | 25 |
| Ubiquitous online initialism | 28 |
| Ubiquitous prescription | 23 |
| Ubiquitous puzzle bird | 22 |
| Ubiquitous puzzle birds | 23 |
| Ubiquitous puzzle plant | 23 |
| Ubiquitous refreshment | 22 |
| Ubiquitous Yule bell-ringers | 28 |
| UC-Santa Barbara squad | 22 |
| UCLA's conference, once | 27 |
| UEFA Euro 2004 champion | 23 |
| UFC bout ender, at times | 24 |