In 1920 they joined the Middlesex League, before switching to the Spartan League.

Their biggest rival is the Wilmington Wildcats of the Middlesex League, whom the football team plays every Thanksgiving.

Burlington is a member of the Middlesex League.

The Wilmington High School Wildcats were a member through the 2010-2011 school year, after which they moved to the Middlesex League.

The Middlesex League is a high school sports conference located in Middlesex County, Massachusetts.

Lexington's teams compete in the Middlesex League.

The LHS golf team has won (or shared the title) of the Middlesex League 4 out of the past 6 years.

Hampton's early years were spent in the Kingston & District and the South West Middlesex Leagues.

Part of the Middlesex League, the sports teams are called the Rockets in a nod to the Nike missile sites once active in the town.

Wilmington High's mascot is the wildcat and its athletic teams participate in the Middlesex League.