The other five charter members were Bridgeport, which closed in 1966; Phoenixville; Pottstown; Spring City, which later merged with Royersford High School and became Spring-Ford; and Tredyffrin-Easttown, which later became Conestoga.
By the middle of the 1980s, the great disparity in size between the largest and smallest schools became much more pronounced with the growth of classification-based postseason play.
The Ches-Mont League could not agree on how to create relief for the situation, so the smaller, more rural, schools took matters into their own hands.
But at the end of the 1988 scholastic year, two more schools left for the Pioneer Conference and a third, Boyertown, decided to make one of its periodic moves to District 3.
It managed to find ways of coping with its small size through creative scheduling - for example, in football, each school played the others twice in the regular season.
In 2007, just after the creation of Bayard Rustin, the third West Chester high school, Avon Grove was offered admission to the league.
[2] After a few meetings, the league decided to offer admittance to Great Valley, Kennett, Octorara, Oxford, and Unionville from the SCCL.