MA: Mercersburg Academy
MA: Moravian Academy
MAHS: Mars Area High School
MAHS: McKeesport Area High School
MAHS: Middletown Area High School
MAHS: Montoursville Area High School
MAHS: Moon Area High School
MAHS: Mt. Alvernia High School
MASD: Mahanoy Area School District
MASD: Mars Area School District
MASD: McKeesport Area School District
MASD: Mechanicsburg Area School District
MASD: Mercer Area School District
MASD: Meyersdale Area School District
MASD: Middletown Area School District
MASD: Mifflinburg Area School District
MASD: Millersburg Area School District
MASD: Millville Area School District
MASD: Milton Area School District
MASD: Minersville Area School District
MASD: Mohawk Area School District
MASD: Montgomery Area School District
MASD: Montoursville Area School District
MASD: Montrose Area School District
MASD: Moon Area School District
MBHS: Monsignor Bonner High School
MBSD: Midland Borough School District
MCASD: Marion Center Area School District
MCASD: Mount Carmel Area School District
MCCS: Mount Carmel Christian School
MCFC: Mont Clare Fire Company
MCFD: Mahanoy City Fire Department
MCHS: Manheim Central High School
MCHS: Marian Catholic High School
MCS: Mill Creek School
MCSD: Manheim Central School District
MCSD: Mifflin County School District
MCSO: McKean County Sheriff's Office
MCSO: Mercer County Sheriff's Office
MCSO: Monroe County Sheriff's Office