Merton School is part of the Arrowhead Middle School Athletic Conference (AMSAC). The AMSAC Conference also includes the following schools: Erin, Friess Lake, Lake Country, North Lake, North Shore, Richmond, Stone Bank and Swallow.
The AMSAC Conference is a recreational league that offers basketball (grades 5-8) and volleyball (grades 6-8). The AMSAC conference, in coordination with Arrowhead High School, also offers the following cooperative programs: cross country, golf, gymnastics, track and wrestling. The AMSAC Conference is a recreational league that encourages participants of varying levels including those who have never played before and those who are involved in select leagues.