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17 Longest Running TV Shows of All Time, From "Grey's Anatomy" to "SVU"
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10

"Gunsmoke" (1955-1975)

  • Seasons: 20
  • Episodes: 635

Historic TV series often appeal to several generations, made evident by the longevity of "Gunsmoke." Set in the 1870s, the show highlights the daily experiences of Marshall Matt Dillon, who is trying to establish order in the crime-ridden Dodge City.

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