There are four movies in the Halloweentown series.
The films are Halloweentown (1998), Halloweentown II: Kalabar's Revenge (2001), Halloweentown High (2004), and Return to Halloweentown (2006). Together, they follow Marnie Piper and her family as they discover and develop their magical heritage.
The series is centered on Halloweentown, a hidden community inhabited by magical beings who separated themselves from the human world. Travel between the two worlds is initially possible only with magical help, especially around Halloween. The films expand that premise from a family mystery into stories about portals, school exchanges, prophecies, and witch university.
A common mix-up is counting the animated Chibi Tiny Tales shorts released in 2020. Those are promotional spin-offs, not additional feature-length Halloweentown movies, so the main film series remains a four-film franchise.