The Beverly Hillbillies Jed Clampett's swamp is loaded with oil. When a wildcatter discovers the huge pool, Jed sells his land to the O.K. Oil Company and at the urging of cousin Pearl, moves his family to a 35-room mansion in Beverly Hills, California. Details Casts Season Lists Title The Beverly Hillbillies Genres Comedy Family First Air Date 1962-09-26 Last Air Date 1971-03-23 Episode Runtime 00 Hours 25 Minutes Total Season(s) 9 Total Episode(s) on All Seasons 274 Runtime 25 Production Companies McCadden Productions, Filmways Television, Filmways Pictures Buddy Ebsen Jed "JD" Clampett Irene Ryan Granny Donna Douglas Elly May Clampett Max Baer Jr. Jethro Bodine Raymond Bailey Milburn Drysdale Nancy Kulp Jane Hathaway Season 1 36 Episodes 1962-09-26 Season 2 36 Episodes 1963-09-25 Season 3 34 Episodes 1964-09-23 Season 4 32 Episodes 1965-09-15 Season 5 30 Episodes 1966-09-14 Season 6 30 Episodes 1967-09-06 Season 7 26 Episodes 1968-09-25 Season 8 26 Episodes 1969-09-24 Season 9 24 Episodes 1970-09-15