50 Longest Running Primetime TV Shows

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Source: Courtesy of Viacom Media Networks

40. The Challenge (1998-present)
> Series run: 20 years
> Network: MTV
> Genre: Reality game show
> IMDb user rating: 7.5/10

Source: Courtesy of CBS Television Distribution

39. Gunsmoke (1955-1975)
> Series run: 20 years
> Network: CBS
> Genre: Drama
> IMDb user rating: 8.0/10

Source: Courtesy of NBCUniversal Television Distribution

38. Law & Order (1990-2010)
> Series run: 20 years
> Network: NBC
> Genre: Crime drama
> IMDb user rating: 7.7/10

Source: Courtesy of CNN

37. Evans, Novak, Hunt & Shields (1982-2002)
> Series run: 20 years
> Network: CNN
> Genre: Political discussion
> IMDb user rating: N/A/10

Source: Courtesy of South Park Studios - Comedy Central

36. South Park (1997-present)
> Series run: 20 years
> Network: Comedy Central
> Genre: Animated sitcom
> IMDb user rating: 8.7/10