There are fifteen teams in the division, with the champions promoted to the Welsh Alliance League and the bottom two teams relegated to the Anglesey League.
Menai Bridge Tigers were champions in the previous season, however runners-up Gwalchmai gained promotion to the Welsh Alliance League Division 2 after Menai Bridge Tigers were refused promotion by the FAW due to inadequate toilet facilities.
[1] Bangor 1876 a new club founded by the supporters of Bangor City and Bethesda Athletic joined the league at the start of the season.
[3] During the pre-season Bryngwran Bulls and Trearddur Bay United merged to form Trearddur Bay Bulls.
[4] Llannerch-y-medd joined the Gwynedd League after resigning from the Welsh Alliance League due to losing the entire squad of players from the previous season for various reasons.