I believe that the longest-running American sitcom was The Adventures of Ozzie and Harriet. The show lasted 14 years which ran from 1952 to 1966 and produced over 400 episodes. However, "Ozzie & Harriet" may not be the longest-running American sitcom for much longer since The Simpsons will be ending its 14th year this spring and thus beginning its 15th year next fall.
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