Cities in Commonwealth of Pennsylvania, United States ( 562 )
- Marietta, Pennsylvania
- Marysville, Pennsylvania
- Masontown, Pennsylvania
- Matamoras, Pennsylvania
- Maytown, Pennsylvania
- McChesneytown-Loyalhanna
- McGovern, Pennsylvania
- McKees Rocks, Pennsylvania
- McKeesport
- McMurray, Pennsylvania
- McSherrystown
- Meadowood, Pennsylvania
- Meadville, Pennsylvania
- Mechanicsburg, Pennsylvania
- Mechanicsville, Pennsylvania
- Media, Pennsylvania
- Meridian, Pennsylvania
- Middletown, Dauphin County, Pennsylvania
- Middletown, Northampton County, Pennsylvania
- Midland, Pennsylvania
- Midland, Pennsylvania
- Mifflinburg
- Millersburg, Pennsylvania
- Millersville, Pennsylvania
- Millvale, Pennsylvania
- Milton, Pennsylvania
- Minersville, Pennsylvania
- Mohnton
- Monaca
- Monessen
- Monongahela, Pennsylvania
- Monroeville, Pennsylvania
- Montgomeryville, Pennsylvania
- Montoursville
- Moosic
- Morrisville, Pennsylvania