Shows With More Than 20 Seasons That Keep Getting Better

These days, a TV show that runs more than five seasons is uncommon. Miniseries and short-lived series tell their stories succinctly, with a clear beginning and end, while procedurals, kids' shows and cartoons are the usual exceptions that keep going because audiences keep tuning in.

Even rarer is a series that stays as good as it started—or becomes better—but a few have managed that feat. South Park remains perhaps the most vulgar and risqué of long-running adult animated sitcoms. Its controversial humor and refusal to take itself too seriously have held steady across 28 seasons, the latest of which premiered in October 2025.

Creators Trey Parker and Matt Stone continue to push the envelope with scathing skits and an anything-goes approach that keeps longtime fans engaged. Sesame Street stands out as an iconic educational series that has kept pace by moving to streaming—first HBO Max, then Netflix.

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