| One of the Siamese twins | 24 |
| One of the SI base units | 24 |
| One of the Sex Pistols | 22 |
| One of the Seven Wonders | 24 |
| One of the Seven Wise Men | 25 |
| One of the Seven Sisters | 24 |
| One of the Seven Hills | 22 |
| One of the Seven Dwarfs | 23 |
| One of the seven deadly sins | 28 |
| One of the seven deadlies | 25 |
| One of the seven conts. | 23 |
| One of the seven continents | 27 |
| One of the seven basic tastes | 29 |
| One of the services: Abbr. | 26 |
| One of the Scottish gentry | 26 |
| One of the sandbox set | 22 |
| One of the San Juan Islands | 27 |
| One of the same bloodline | 25 |
| One of the sales staff | 22 |
| One of the sales force | 22 |
| One of the S's in U.S.S. | 28 |
| One of the S's in SST | 25 |
| One of the Rushmore quartet | 27 |
| One of the Royal Family | 23 |
| One of the Roman Fates | 22 |
| One of the Rolling Stones | 25 |
| One of the Rockefellers | 23 |
| One of the rivers of Hades | 26 |
| One of the Ringling Brothers | 28 |
| One of the Righteous Brothers | 29 |
| One of the Rhine Maidens | 24 |
| One of the ref's set | 24 |
| One of the Reds' rivals | 27 |
| One of the Redgrave sisters | 27 |
| One of the Red Sox pitchers | 27 |
| One of the recent frosh | 23 |
| One of the Rayong throng | 24 |
| One of the rare earths | 22 |
| One of the Rams' QB's | 29 |
| One of the R's of R&R | 29 |
| One of the Queen's pets | 27 |
| One of the Quechuan people | 26 |
| One of the Quad Cities | 22 |
| One of the Prozorov sisters | 27 |
| One of the Princetonians | 24 |
| One of the pride of Joy | 23 |
| One of the prexy's staff | 28 |
| One of the Prairie Provinces | 28 |
| One of the Power Rangers | 24 |
| One of the Poor Clares | 22 |
| One of the Ponderosa boys | 25 |
| One of the Pointer Sisters | 26 |
| One of the Plain People | 23 |
| One of the Pine Islands | 23 |
| One of the Pillars of Islam | 27 |
| One of the phys. sciences | 25 |
| One of the Philippines | 22 |
| One of the Parnassus nine | 25 |
| One of the Parcae et al. | 24 |
| One of the Palin children | 25 |
| One of the Pac-Man ghosts | 25 |
| One of the Pac-Man characters | 29 |
| One of the Orkney Islands | 25 |
| One of the original 13: Abbr. | 29 |
| One of the original 13 | 22 |
| One of the Olsen twins | 22 |
| One of the Olsen sisters | 24 |
| One of the oceans: Abbr. | 24 |
| One of the Obama girls | 22 |
| One of the Obama daughters | 26 |
| One of the Oasis brothers | 25 |
| One of the O'Neills | 23 |
| One of the North Africans | 25 |
| One of the noble metals | 23 |
| One of the noble gases | 22 |
| One of the nightshade family | 28 |
| One of the Nielsen brothers | 27 |
| One of the NFL Mannings | 23 |
| One of the New Hebrides | 23 |
| One of the Near Islands | 23 |
| One of the musical Guthries | 27 |
| One of the musical B's | 26 |
| One of the Ms. Pac-Man ghosts | 29 |
| One of the Mrs. Sinatras | 24 |
| One of the moveable feasts | 26 |
| One of the moons of Uranus | 26 |
| One of the Minor Prophets | 25 |
| One of the midday-sun seekers | 29 |
| One of the Mercury Seven | 24 |
| One of the Menendez brothers | 28 |
| One of the men behind bars | 26 |
| One of the media: Var. | 22 |
| One of the media: Abbr. | 23 |
| One of the Mayberry gang | 24 |
| One of the Maverick brothers | 28 |
| One of the Marx brothers | 24 |
| One of the martial arts | 23 |
| One of the Marshall Islands | 27 |
| One of the Marsalis brothers | 28 |
| One of the Mario brothers | 25 |