| Longest-running TV series | 25 |
| Longest-serving | 15 |
| Longest-serving Boston Symphony director | 40 |
| Longest-serving current Supreme Court justice | 45 |
| Longest-serving Dodger coach Manny | 34 |
| Longest-serving French president | 32 |
| Longest-serving KGB chairman (1967-'82) | 43 |
| Longest-serving late-night TV host in the US | 44 |
| Longest-serving member | 22 |
| Longest-serving ones | 20 |
| Longest-serving Prime Minister of India | 39 |
| Longest-serving senator in U.S. history | 39 |
| Longevity | 9 |
| Longevity at the box office | 27 |
| Longfellow and Burns | 20 |
| Longfellow bell town | 20 |
| Longfellow character | 20 |
| Longfellow chief | 16 |
| Longfellow classic | 18 |
| Longfellow classic containing a code that is represented within the answers to the asterisked Down clues | 104 |
| Longfellow concern | 18 |
| Longfellow creation | 19 |
| Longfellow girl in "Children's Hour" | 50 |
| Longfellow hero | 15 |
| Longfellow heroine | 18 |
| Longfellow locale | 17 |
| Longfellow lover | 16 |
| Longfellow maiden | 17 |
| Longfellow or Millay, by birth | 30 |
| Longfellow poem | 15 |
| Longfellow poem subject | 23 |
| Longfellow poem subtitled "A Tale of Acadie" | 54 |
| Longfellow poem, with "The" | 37 |
| Longfellow setting | 18 |
| Longfellow subject | 18 |
| Longfellow town | 15 |
| Longfellow's "A ___ of Life" | 42 |
| Longfellow's "loveliest of Dacotah women" | 55 |
| Longfellow's "mighty man" | 39 |
| Longfellow's "murmuring" trees | 44 |
| Longfellow's "Tales of a Wayside ___" | 51 |
| Longfellow's "Tales of a ___" | 43 |
| Longfellow's "The Bell of __" | 43 |
| Longfellow's "The Bell of ___" | 44 |
| Longfellow's "The Bells of San ___" | 49 |
| Longfellow's "The ___ at Springfield" | 51 |
| Longfellow's bell town | 26 |
| Longfellow's contemporary | 29 |
| Longfellow's Evangeline and Gabriel, e.g. | 45 |
| Longfellow's Gitche Gumee, more familiarly | 46 |
| Longfellow's greeting | 25 |
| Longfellow's Hiawatha, e.g. | 31 |
| Longfellow's Indian hero | 28 |
| Longfellow's king | 21 |
| Longfellow's middle name | 28 |
| Longfellow's murmurers | 26 |
| Longfellow's village craftsman | 34 |
| Longfellow's words before "O Ship of State!" | 58 |
| Longfellow's wreck | 22 |
| Longfellow's wrecked ship | 29 |
| Longfellow, in a 1936 movie | 27 |
| Longhair | 8 |
| Longhaired cat | 14 |
| Longhaired dog, familiarly | 26 |
| Longhaired domestic cat | 23 |
| Longhaired fad dolls | 20 |
| Longhaired feline | 17 |
| Longhaired lap dog, for short | 29 |
| Longhaired pet | 14 |
| Longhairs | 9 |
| Longhauler's rig | 20 |
| Longhom | 7 |
| Longhorn | 8 |
| Longhorn beetle, for one | 24 |
| Longhorn rival | 14 |
| Longhorn State sch. | 19 |
| Longhorn State school near the Mex. border | 42 |
| Longhorn's grid rival | 25 |
| Longhorn's lament? | 22 |
| Longhorn's Red River rival | 30 |
| Longhorn's rival | 20 |
| Longhorn's school, informally | 33 |
| Longhorn, for one | 17 |
| Longhorns | 9 |
| Longhorns' rival, briefly | 29 |
| Longhorns' rivals | 21 |
| Longhorns, e.g. | 15 |
| Longhorns, etc. | 15 |
| Longhorns, to Aggies | 20 |
| Longhouse dwellers | 18 |
| Longines rival | 14 |
| Longing | 7 |
| Longing (for) | 13 |
| Longing feeling | 15 |
| Longing for ''the good old days'' | 49 |
| Longing for "the good old times" | 42 |
| Longing for a fronded plant? | 28 |
| Longing for a type of money? | 28 |
| Longing for Japanese money? | 27 |
| Longing look | 12 |