| U.S. Army Corps member | 22 |
| U.S. Army cops | 14 |
| U.S. Army Chief of Staff: 1972–74 | 40 |
| U.S. Army branch | 16 |
| U.S. Army award: Abbr. | 22 |
| U.S. Army attack helicopter | 27 |
| U.S. Armed Forces award for those wounded in action | 51 |
| U.S. area where industry once thrived | 37 |
| U.S. architects' org. | 25 |
| U.S. archeologist | 17 |
| U.S. anti-trafficking grp. | 26 |
| U.S. anthropologist: 1901–78 | 35 |
| U.S. anthropologist | 19 |
| U.S. anthem-starting words | 26 |
| U.S. anthem lyricist | 20 |
| U.S. anthem contraction | 23 |
| U.S. annexation: 1845 | 21 |
| U.S. and state groups | 21 |
| U.S. and others | 15 |
| U.S. and French Open winner Nastase | 35 |
| U.S. and Bethlehem | 18 |
| U.S. ancestral org. | 19 |
| U.S. ambassador's employer | 30 |
| U.S. ambassador to the Soviet Union during W.W. II | 50 |
| U.S. Ambassador in Moscow | 25 |
| U.S. ally whose capital has the letters U-S-A in the middle of its name: Abbr. | 78 |
| U.S. ally since '48 | 23 |
| U.S. ally in WWII | 17 |
| U.S. ally in W.W. II | 20 |
| U.S. ally in the American Revolution | 36 |
| U.S. alliance | 13 |
| U.S. alien's subj. | 22 |
| U.S. Airways info | 17 |
| U.S. Airways competitor | 23 |
| U.S. airspace monitor | 21 |
| U.S. airport regulator | 22 |
| U.S. airline, once | 18 |
| U.S. air-to-air missiles | 24 |
| U.S. air-to-air missile | 23 |
| U.S. air-safety overseer | 24 |
| U.S. air-safety grp. | 20 |
| U.S. air pollution monitor | 26 |
| U.S. air org. | 13 |
| U.S. air monitor | 16 |
| U.S. Air Force Academy's Cadet Chapel, for example | 54 |
| U.S. air base site in Greenland | 31 |
| U.S. air base in Spain | 22 |
| U.S. air agency | 15 |
| U.S. agricultural agcy. | 23 |
| U.S. agents | 11 |
| U.S. agent: Abbr. | 17 |
| U.S. agent | 10 |
| U.S. agency: Abbr. | 18 |
| U.S. agency: 1933-43 | 20 |
| U.S. agency with a "CryptoKids" program | 49 |
| U.S. agency in the news | 23 |
| U.S. agency est. 1958 | 21 |
| U.S. agency | 11 |
| U.S. agcy.: 1948–51 | 26 |
| U.S. agcy., 1948–51 | 26 |
| U.S. agcy. since 1958 | 21 |
| U.S. agcy. since 1933 | 21 |
| U.S. agcy. for senior citizens | 30 |
| U.S. adversary in 1812 | 22 |
| U.S. admiral: 1837–1917 | 30 |
| U.S. admiral of W. W. I | 23 |
| U.S. admiral of 1898 | 20 |
| U.S. actress: 1865-1932 | 23 |
| U.S. accident investigator | 26 |
| U.S. abolitionist: 1805-79 | 26 |
| U.S. 66, for one | 16 |
| U.S. 66 and I-95 | 16 |
| U.S. 41 in part | 16 |
| U.S. 36 crosses it | 18 |
| U.S. 101, for one | 17 |
| U.S. 101, e.g.: Abbr. | 21 |
| U.S. 101, e.g. (Abbr.) | 22 |
| U.S. 101 locale: Abbr. | 22 |
| U.S. 1, for one: Abbr. | 22 |
| U.S. 1, for one | 15 |
| U.S. 1, etc. | 12 |
| U.S. 1, e.g. | 12 |
| U.S. 1's northern terminus | 30 |
| U.S. 1 is one | 13 |
| U.S. 1 and U.S. 66 | 18 |
| U.S. 1 and others: Abbr. | 24 |
| U.S. 1 and others | 17 |
| U.S. 1 and I 95 | 15 |
| U.S. "Big Brother" host | 33 |
| U.S. "ashcan" painter | 31 |
| U.S. 'Uncle' | 20 |
| U.S. 'Ltd.' | 19 |
| U.S. ''Star Wars'' plan | 39 |
| U.S. $10 coin, until 1933 | 25 |
| U.S. | 4 |
| U.R.L. start | 12 |
| U.R.L. part | 11 |
| U.R.L. opener indicating an additional layer of encryption | 58 |
| U.R.L. lead-in | 14 |
| U.R.L. ending that's not "com" or "gov" | 63 |