The 40 Longest-Running American TV Shows of All Time

These primetime scripted TV series have aired more episodes than you would believe.

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"Is that still on?" you'll hear people ask about one of your favorite shows. Amazingly enough, yes, some of the longest-running American TV shows of all time are still going strong, cranking out more episodes than the vast majority of series will ever come close to. Our list of these overachievers is comprised of shows like Grey's Anatomy that remain on the air, along with series that aired their final episode decades ago. Either way, you'll be blown away to discover just how many hours of television these iconic shows are responsible for.

To keep things from spinning too wildly out of control, we're focusing on primetime, scripted, non-anthology series—with apologies to the soap operas, news programs, and late-night shows that have redefined staying power. With that in mind, take a look at our ranking of the 40 longest-running American TV shows ever made, from least to most episodes. And for more television nostalgia, revisit these 20 Beloved TV Shows You Won't Believe Are 20 Years Old.

40
M*A*S*H (1972-1983)

still from mash
20th Television

256 episodes

And for more shows that came to a memorable conclusion, these are The 25 Best TV Series Finales of All Time.

39
Married… with Children (1987-1997)

married with children
Sony Pictures Television

259 episodes

38
King of the Hill (1997-2009)

king of the hill
Disney–ABC Domestic Television

259 episodes

And for some less enduring series, check out these 20 '90s TV Shows You've Completely Forgotten About.

37
The Jack Benny Program (1950-1965)

the jack benny program
Prime Video

260 episodes

36
Murphy Brown (1988-2018)

murphy brown
Warner Bros. Television Distribution

260 episodes

And for more shows that came back to little fanfare, here are The 13 Most Disappointing TV Reboots of All Time.

35
Mama (1949-1956)

still from mama
PR Studios

261 episodes

34
NYPD Blue (1993-2005)

nypd blue
20th Television

261 episodes

33
Two and a Half Men (2003-2015)

two and a half men
Warner Bros. Domestic Television Distribution

262 episodes

And for more series that continued on without their leads, check out these 13 TV Shows That Lost Their Stars.

32
NCIS: Los Angeles (2009-)

ncis los angeles
CBS Television Distribution

262 episodes

31
Frasier (1993-2004)

still from frasier
CBS Television Distribution

264 episodes

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30
Murder, She Wrote (1984-1996)

murder she wrote
NBCUniversal Television Distribution

264 episodes

29
Perry Mason (1957-1966)

perry mason
CBS Television Distribution

271 episodes

28
The Beverly Hillbillies (1962-1971)

the beverly hillbillies
CBS Television Distribution

274 episodes

27
The Donna Reed Show (1958-1966)

the donna reed show
Screen Gems

275 episodes

26
Cheers (1982-1993)

still from cheers
ViacomCBS Domestic Media Networks

275 episodes

25
Dragnet (1951-1959)

still from dragnet
NBC

276 episodes

24
The Big Bang Theory (2007-2019)

the big bang theory
Warner Bros. Television Distribution

279 episodes

23
Hawaii Five-O (1968-1980)

hawaii five-o
CBS Television Distribution

279 episodes

22
Wagon Train (1957-1965)

still from wagon train
NBCUniversal Television Distribution

284 episodes

21
The George Burns and Gracie Allen Show (1950-1958)

The George Burns and Gracie Allen Show
Screen Gems

291 episodes

20
Beverly Hills, 90210 (1990-2000)

beverly hills 90210
CBS Television Distribution

293 episodes

19
American Dad! (2005-)

still from american dad
Disney-ABC Domestic Television

297 episodes

18
Supernatural (2005-)

still from supernatural
The CW

320 episodes

17
Criminal Minds (2005-2020)

still from criminal minds
CBS Television Distribution

324 episodes

16
ER (1994-2009)

still from er
Warner Bros. Domestic Television Distribution

331 episodes

15
CSI: Crime Scene Investigation (2000-2015)

marg helgenberger on csi crime scene investigation
CBS Television Distribution

337 episodes

14
The Danny Thomas Show (1953-1964)

the danny thomas show
Stadium Media

343 episodes

13
Knots Landing (1979-1993)

knots landing
Warner Bros. Television Distribution

344 episodes

12
Family Guy (1999-)

still from family guy
Fox

349 episodes

11
Dallas (1978-1991)

still from dallas
Warner Bros. Television Distribution

357 episodes

10
Grey's Anatomy (2005-)

still from grey's anatomy
ABC

363 episodes

9
My Three Sons (1960-1972)

still from my three sons
CBS Television Distribution

380 episodes

8
NCIS (2003-)

still from NCIS
CBS Television Distribution

398 episodes

7
Bonanza (1959-1973)

still from bonanza
CBS Television Distribution

431 episodes

6
The Adventures of Ozzie and Harriet (1952-1966)

the adventures of ozzie and harriet
Shout Factory

435 episodes

5
Law & Order (1990-2010)

still from law and order
NBCUniversal Television Distribution

456 episodes

4
Law & Order: Special Victims Unit (1999-)

stabler and benson in law and order special victims unit
NBC

478 episodes

3
Lassie (1954-1971)

still from lassie
NBCUniversal Television Distribution

591 episodes

2
Gunsmoke (1955-1975)

still from gunsmoke
CBS Television Distribution

635 episodes

1
The Simpsons (1989-)

the simpsons
Fox

684 episodes

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