| U.S. national flower | 20 |
| U.S. native | 11 |
| U.S. naturalist | 15 |
| U.S. naturalist and writer | 26 |
| U.S. naturalist: 1838-1914 | 26 |
| U.S. naturalist: 1838–1914 | 33 |
| U.S. nature writer | 18 |
| U.S. Naval Academy freshman | 27 |
| U.S. naval base in Spain | 24 |
| U.S. naval base until 1951 | 26 |
| U.S. naval force in Japan | 25 |
| U.S. naval historian | 20 |
| U.S. naval historian: 1840–1914 | 38 |
| U.S. Naval Observatory residents | 32 |
| U.S. Naval Observatory's precise info | 41 |
| U.S. naval strategist | 21 |
| U.S. naval vessel | 17 |
| U.S. naval writer | 17 |
| U.S. Navy adjunct | 17 |
| U.S. Navy base in Cuba, slangily | 32 |
| U.S. Navy builder | 17 |
| U.S. Navy craft | 15 |
| U.S. Navy engineer | 18 |
| U.S. Navy off. | 14 |
| U.S. Navy officer | 17 |
| U.S. Navy officer who smokes a water pipe? | 42 |
| U.S. Navy submarine builder | 27 |
| U.S. neighbor | 13 |
| U.S. newcomer's course | 26 |
| U.S. newcomer's course, perhaps | 35 |
| U.S. newcomer's language course, perhaps | 44 |
| U.S. News or YM | 15 |
| U.S. newspaper publisher: 1858–1935 | 42 |
| U.S. Nobelist in Literature: 1938 | 33 |
| U.S. noncom | 11 |
| U.S. notable | 12 |
| U.S. novelist | 13 |
| U.S. novelist-poet | 18 |
| U.S. novelist: 1815–82 | 29 |
| U.S. nuclear sub | 16 |
| U.S. observatory | 16 |
| U.S. occupied island until 1968 | 31 |
| U.S. offering to investors | 26 |
| U.S. official whose office has been vacant for more than nine of the last 50 years | 82 |
| U.S. oil giant | 14 |
| U.S. Olympic and welterweight champ | 35 |
| U.S. Olympic champion, 1956 | 27 |
| U.S. Olympic diver Louganis | 27 |
| U.S. Olympic gymnast Chow | 25 |
| U.S. Olympic skier | 18 |
| U.S. Olympic swimming gold medalist Torres | 42 |
| U.S. Open category | 18 |
| U.S. Open champ before and after Pete | 37 |
| U.S. Open champ Ernie | 21 |
| U.S. Open champ in '94 and '97 | 38 |
| U.S. Open champ Tony: 1936 | 26 |
| U.S. Open champ, 1968 | 21 |
| U.S. Open champ, 1985-87 | 24 |
| U.S. Open champ, Arthur | 23 |
| U.S. Open champ: 1976 | 21 |
| U.S. Open champion whose last name is a toy | 43 |
| U.S. Open champion: 1968 | 24 |
| U.S. Open component | 19 |
| U.S. Open do-over | 17 |
| U.S. Open entrant | 17 |
| U.S. Open golf champ: 1927 | 26 |
| U.S. Open golf champ: 1959 | 26 |
| U.S. Open golf champ: 1988-89 | 29 |
| U.S. Open golf champion Ernie | 29 |
| U.S. Open judge's shout | 27 |
| U.S. Open org. | 14 |
| U.S. Open park, for short | 25 |
| U.S. Open players, usually | 26 |
| U.S. Open singles champ: 1972 | 29 |
| U.S. Open stadium | 17 |
| U.S. Open stadium name | 22 |
| U.S. Open tennis champ: 1963 | 28 |
| U.S. Open tennis champ: 1966 | 28 |
| U.S. Open tennis champ: 1968 | 28 |
| U.S. Open tennis finalist eight straight years | 46 |
| U.S. Open tennis stadium | 24 |
| U.S. Open tennis victor over Arthur: 1972 | 41 |
| U.S. Open units | 15 |
| U.S. Open winner Els | 20 |
| U.S. Open winner from Argentina | 31 |
| U.S. Open winner in 1997 | 24 |
| U.S. Open winner of 1994 and 1997 | 33 |
| U.S. Open winner, 1994 and 1997 | 31 |
| U.S. Open winner: 1934 | 22 |
| U.S. Open winner: 1961 | 22 |
| U.S. Open winner: 1976 | 22 |
| U.S. Open winner: 1977 | 22 |
| U.S. Open's ___ Stadium | 27 |
| U.S. Open, e.g. | 15 |
| U.S. operative | 14 |
| U.S. or British mil. award | 26 |
| U.S. or Can. money | 18 |
| U.S. or English poet | 20 |
| U.S. orator | 11 |
| U.S. orator and family | 22 |