The Simpsons joins a very exclusive club of U.S. scripted primetime shows when its 600th episode, “Treehouse of Horror XXVII” airs. How rare is this club? The only other scripted primetime show to reach 600 episodes is Gunsmoke ...
The Western still holds the lead in total episodes with 635. But the Yellow Family should surpass that mark before the end of its run.
1) Gunsmoke (CBS): 635 episodes; 20 seasons
2) The Simpsons (FOX): 600 episodes; 28 seasons
3) Lassie (CBS and Syndication): 591 episodes; 19 seasons.
4) Law & Order (NBC): 456 episodes; 20 seasons.
5) The Adventures of Ozzie and Harriet (ABC): 435 episodes; 14 seasons.