Currently, the league consists of twelve high schools primarily from Delaware County with additional constituency from Chester and Montgomery counties.
The schools that founded the league were Conestoga, Harriton, Haverford, Lower Merion, Marple, Penncrest, Radnor, Springfield and Upper Darby.
At the end of the 1988 scholastic year, the Ches-Mont League was down to only four schools - Coatesville, Downingtown, West Chester East, and West Chester Henderson.
Thanks to the ruling in this suit, the PIAA has no power to re-align sports leagues.
(High school federations in many other states can re-shape sports leagues at will.)