Schools served by METS include:

Agnes Gray School
Central Elementary School
Central High School
Central Middle School
Cony Middle and High School
Crooked Elementary
Etna-Dixmont School
Farwell Elementary School
Geiger Elementary
Guy E. Rowe Elementary School
J.A. Leanard Middle School
Lake Region High School
Lake Region Middle School
Lawrence High School
Lawrence Middle School
Lewiston High School
Lewiston Middle School
Montello Elementary School
Nokomis High School
Nokomis Middle School
Old Town High School
Oxford Hills Elementary School
Oxford Hills High School
Oxford Hills Middle School
Otisfield Community School
Paris Elementary School
Robert V. Connors Elementary School
Searsport High School
Searsport Middle School
Sebago Elementary School
Stevens Brook Elementary School
Thomas J. McMahon Elementary School