Six clubs participate, a club with the most points participates in the national championships each season while the last placed club from the regional premier division relegates into the second division the following season.
In 2013, the main portion became the Premier Division after the Premier Division was added.
Paulense has the most island titles with six and will total seven on its entirety in late March, second is Solpontense with five, third is Rosariense with three and three clubs Beira-Mar and Foguetões and now Sinagoga with only one title.
The left indicates the participation in the North Zone and its Premier Division, inside the bracket is overall participation as one island and the North Zone.