It's Always Sunny in Philadelphia

It’s Always Sunny in Philadelphia holds the record as the longest-running live-action comedy in American TV history, a feat unmatched by any other sitcom on this list. Since its 2005 debut, the show’s deliberately despicable characters have redefined comedic boundaries, earning a 100% fresh rating on Rotten Tomatoes for its 16th season. Unlike the polished ensembles of #1 The Office, The Gang’s relentless selfishness creates a uniquely cringe-worthy yet addictive viewing experience. The series averages 8.8 million viewers per episode across platforms, outperforming #7 Malcolm in the Middle in longevity and cultural impact.