Place
- Pennsylvania--Mch1
- Pennsylvania--Mechanicsville1
- Pennsylvania--Middleport1
- Pennsylvania--Middletown Township1
- Pennsylvania--Mifflin1
- Pennsylvania--Mifflin Township1
- Pennsylvania--Mill Hall1
- Pennsylvania--Millersville1
- Pennsylvania--Millfred Terrace1
- Pennsylvania--Millheim1
- Pennsylvania--Minard Run1
- Pennsylvania--Miners Mills1
- Pennsylvania--Modena1
- Pennsylvania--Mohnton1
- Pennsylvania--Monroton (sic)1
- Pennsylvania--Morea1
- Pennsylvania--Morganza1
- Pennsylvania--Morrisdale1
- Pennsylvania--Mount Bethel1
- Pennsylvania--Mount Morris1