Schools served by METS include:

Agnes Gray School
Caribou Community School
Caribou High 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
Lake Region High School
Lake Region Middle School
Lewiston High School
Lewiston Middle School
Montello Elementary School
Nokomis High School
Nokomis Middle 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. McMahaon Elementary School
Woodland Consolidated School