| Longfellow classic | 18 |
| Longfellow chief | 16 |
| Longfellow character | 20 |
| Longfellow bell town | 20 |
| Longfellow and Burns | 20 |
| Longevity at the box office | 27 |
| Longevity | 9 |
| Longest-serving senator in U.S. history | 39 |
| Longest-serving Prime Minister of India | 39 |
| Longest-serving ones | 20 |
| Longest-serving member | 22 |
| Longest-serving late-night TV host in the US | 44 |
| Longest-serving KGB chairman (1967-'82) | 43 |
| Longest-serving French president | 32 |
| Longest-serving Dodger coach Manny | 34 |
| Longest-serving current Supreme Court justice | 45 |
| Longest-serving Boston Symphony director | 40 |
| Longest-serving | 15 |
| Longest-running TV series | 25 |
| Longest-running show in Broadway history until 1/9/06 | 53 |
| Longest-running series on network TV | 36 |
| Longest-running rock trio with the same lineup | 46 |
| Longest-running network TV show | 31 |
| Longest-running member | 22 |
| Longest-running American humor mag | 34 |
| Longest-reigning British monarch | 32 |
| Longest-living member of the Rat Pack | 37 |
| Longest-lived first lady | 24 |
| Longest-lived | 13 |
| Longest word not containing an a, e, i, o, or u | 47 |
| Longest wholly-Swiss river | 26 |
| Longest wholly Swiss river | 26 |
| Longest time span, geologically | 31 |
| Longest time division | 21 |
| Longest time | 12 |
| Longest Swiss waterway | 22 |
| Longest Swiss river (Var.) | 26 |
| Longest Swiss river | 19 |
| Longest street in the world | 27 |
| Longest Spanish river | 21 |
| Longest song on Dylan's "Street-Legal" | 52 |
| Longest side of a rt. triangle | 30 |
| Longest sentence? | 17 |
| Longest sentence to complete | 28 |
| Longest sentence | 16 |
| Longest river within Spain | 26 |
| Longest river wholly in Spain | 29 |
| Longest river on the Iberian Peninsula | 38 |
| Longest river of Spain | 22 |
| Longest river of Scotland | 25 |
| Longest river of France | 23 |
| Longest river of Europe | 23 |
| Longest river of Asia | 21 |
| Longest river in the world | 26 |
| Longest river in Texas | 22 |
| Longest river in Switzerland | 28 |
| Longest river in Spain | 22 |
| Longest river in Scotland | 25 |
| Longest river in France | 23 |
| Longest river in Europe | 23 |
| Longest river in Deutschland | 28 |
| Longest river in Africa | 23 |
| Longest river entirely within Switzerland | 41 |
| Longest river entirely in Switzerland | 37 |
| Longest river entirely in Spain | 31 |
| Longest river | 13 |
| Longest reptile in the longest river? | 37 |
| Longest possible sentence | 25 |
| Longest possible chord | 22 |
| Longest parts of the alimentary canal | 37 |
| Longest or shortest day | 23 |
| Longest of the Finger Lakes | 27 |
| Longest of long odds | 20 |
| Longest of its kind in the human body | 37 |
| Longest number when spelled out in words that has no repeated letters | 69 |
| Longest note? | 13 |
| Longest mountain range | 22 |
| Longest modern note | 19 |
| Longest modern musical note | 27 |
| Longest lasting | 15 |
| Longest key | 11 |
| Longest human bone | 18 |
| Longest French river | 20 |
| Longest flower? | 15 |
| Longest flower in the world | 27 |
| Longest European river | 22 |
| Longest entry in the ''OED'' | 44 |
| Longest division of time, in geology | 36 |
| Longest division of geological time (var.) | 42 |
| Longest division of geological time | 35 |
| Longest division of geologic time | 33 |
| Longest continuous corporate partner of the Olympic Games | 57 |
| Longest continental mountain range | 34 |
| Longest Canadian waterway | 25 |
| Longest book of the Book of Mormon | 34 |
| Longest book of the Bible | 25 |
| Longest book in the Book of Mormon | 34 |
| Longest bone in the body | 24 |
| Longest bone above the waist | 28 |
| Longest bone | 12 |