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Longest-running US Primetime Scripted TV Shows by Episodes Quiz

How well do you know the longest-running US primetime scripted TV shows by episodes? Floored turns the ranking into a building: floor 1 is the top of the list. We name a floor, you guess what's on it, and the lift rides to whatever you picked so you know to go higher or lower.

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How it works

You get a few guesses per floor. Land it on your first guess for 10 points; a near miss still scores. After the TV episodes round, four more lists keep the ride going.

Show the full ranking (30)
  1. The Simpsons 811 episodes
    Matt Groening named Homer, Lisa and Maggie after his own father and younger sisters.
  2. Gunsmoke 635 episodes
    It started on CBS radio in 1952, with William Conrad as the voice of Marshal Matt Dillon.
  3. Law & Order: SVU 596 episodes
    Star Mariska Hargitay is the daughter of 1950s film star Jayne Mansfield.
  4. Lassie 591 episodes
    Lassie is a female character, but the collies playing her were male descendants of the film dog Pal.
  5. Law & Order 546 episodes
    Composer Mike Post created its 'dun dun' scene-change sound, which he calls The Clang.
  6. NCIS 509 episodes
    It was launched through a two-part backdoor pilot on the Navy legal drama JAG.
  7. Grey's Anatomy 467 episodes
    Its title puns on the lead character Meredith Grey and the classic medical textbook Gray's Anatomy.
  8. Family Guy 462 episodes
    Fox cancelled it in 2002, but strong DVD sales and Adult Swim reruns brought it back in 2005.
  9. The Adventures of Ozzie and Harriet 435 episodes
    The real Nelson family played themselves, and son Ricky launched a pop career by singing on the show.
  10. Bonanza 431 episodes
    It was the first Western series filmed and broadcast in full color, partly to help RCA sell color TVs.
  11. American Dad! 401 episodes
    Seth MacFarlane voices both CIA agent Stan Smith and Roger, the alien living in his attic.
  12. My Three Sons 380 episodes
    Fred MacMurray's contract let him shoot all his scenes for a season in just 65 days.
  13. Criminal Minds 364 episodes
    After CBS ended it in 2020, Paramount+ revived it in 2022 as Criminal Minds: Evolution.
  14. Dallas 357 episodes
    About 83 million US viewers tuned in to find out who shot J.R. in November 1980.
  15. Knots Landing 344 episodes
    This Dallas spin-off followed J.R.'s brother Gary Ewing and his wife Valene to California.
  16. The Danny Thomas Show 343 episodes
    A 1960 episode, Danny Meets Andy Griffith, served as the pilot for The Andy Griffith Show.
  17. CSI: Crime Scene Investigation 337 episodes
    Creator Anthony Zuiker was a tram operator at the Mirage hotel in Las Vegas shortly before CBS picked it up.
  18. ER 331 episodes
    Jurassic Park author Michael Crichton wrote its pilot script in 1974, two decades before it aired.
  19. Supernatural 327 episodes
    Sam and Dean Winchester drive a black 1967 Chevrolet Impala that Dean calls Baby.
  20. NCIS: Los Angeles 323 episodes
    LL Cool J played agent Sam Hanna for all 14 seasons.
  21. Bob's Burgers 313 episodes
    The Belcher family made it to the big screen in The Bob's Burgers Movie in 2022.
  22. Chicago Fire 297 episodes
    It kicked off NBC's One Chicago franchise, which went on to add Chicago P.D. and Chicago Med.
  23. Blue Bloods 293 episodes
    Tom Selleck said the Reagan family dinner scenes could take six to eight hours to film.
  24. Beverly Hills, 90210 293 episodes
    Producer Aaron Spelling's daughter Tori played Donna Martin for the entire run.
  25. The George Burns and Gracie Allen Show 291 episodes
    George Burns regularly broke the fourth wall, talking directly to viewers about the plot.
  26. Wagon Train 284 episodes
    Wagon master Ward Bond died in 1960 during the show's run, and John McIntire took over the lead.
  27. Hawaii Five-O 282 episodes
    Most episodes ended with Steve McGarrett telling his partner to 'Book 'em, Danno.'
  28. King of the Hill 279 episodes
    Hulu revived it in 2025 with a season set about 15 years after the Fox run ended.
  29. The Big Bang Theory 279 episodes
    Jim Parsons won four Emmys for playing physicist Sheldon Cooper.
  30. Dragnet 276 episodes
    Jack Webb created and starred in it on NBC radio in 1949, basing it on real LAPD cases.

Source: Wikipedia: List of longest-running scripted American primetime television series · as of 2026-10

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