- Macungie (Population: 3,039)
- Mahanoy City (Population: 4,647)
- Malvern (Population: 3,059)
- Manchester (Population: 2,350)
- Manheim (Population: 4,784)
- Manor (Population: 2,796)
- Mansfield (Population: 3,411)
- Maple Glen (Population: 7,042)
- Marcus Hook (Population: 2,314)
- Marietta (Population: 2,689)
- Mars (Population: 1,746)
- Marshallton (Population: 1,437)
- Martinsburg (Population: 2,236)
- Marysville (Population: 2,306)
- Masontown (Population: 3,611)
- Matamoras (Population: 2,312)
- Mayfield (Population: 1,756)
- Maytown (Population: 2,604)
- McAdoo (Population: 2,274)
- McCandless Township (Population: 29,022)
- McChesneytown-Loyalhanna (Population: 3,415)
- McConnellsburg (Population: 1,073)
- McDonald (Population: 2,281)
- McGovern (Population: 2,538)
- McKees Rocks (Population: 6,622)
- McKeesport (Population: 24,040)
- McMurray (Population: 4,726)
- McSherrystown (Population: 2,691)
- Meadowood (Population: 2,912)
- Meadville (Population: 13,685)
- Mechanicsburg (Population: 9,042)
- Mechanicsville (Population: 515)
- Media (Population: 5,533)
- Mercer (Population: 2,391)
- Mercersburg (Population: 1,540)
- Meridian (Population: 3,794)
- Meyersdale (Population: 2,473)
- Middleburg (Population: 1,382)
- Middletown (Population: 9,242)
- Midland (Population: 3,137)
- Midway (Population: 982)
- Mifflinburg (Population: 3,594)
- Mifflinville (Population: 1,213)
- Milesburg (Population: 1,187)
- Milford (Population: 1,104)
- Mill Hall (Population: 1,568)
- Millersburg (Population: 2,562)
- Millersville (Population: 7,774)
- Millvale (Population: 4,028)
- Milroy (Population: 1,386)
- Milton (Population: 6,650)
- Minersville (Population: 4,552)
- Mohnton (Population: 2,963)
- Monaca (Population: 6,286)
- Monessen (Population: 8,669)
- Monongahela (Population: 4,761)
- Mont Alto (Population: 1,357)
- Montgomery (Population: 1,695)
- Montgomeryville (Population: 12,031)
- Montoursville (Population: 4,777)
- Montrose (Population: 1,664)
- Moosic (Population: 5,575)
- Morrisville (Population: 10,023)
- Morton (Population: 2,715)
- Moscow (Population: 1,883)
- Mount Carmel (Population: 6,390)
- Mount Cobb (Population: 2,140)
- Mount Holly Springs (Population: 1,925)
- Mount Jewett (Population: 1,070)
- Mount Joy (Population: 6,765)
- Mount Lebanon (Population: 33,017)
- Mount Oliver (Population: 3,970)
- Mount Penn (Population: 3,016)
- Mount Pleasant (Population: 4,728)
- Mount Pocono (Population: 2,742)
- Mount Union (Population: 2,504)
- Mount Wolf (Population: 1,373)
- Mountain Top (Population: 15,269)
- Mountainhome (Population: 1,169)
- Mountville (Population: 2,444)
- Muncy (Population: 2,663)
- Munhall (Population: 12,264)
- Municipality of Monroeville (Population: 29,349)
- Municipality of Murrysville (Population: 18,872)
- Myerstown (Population: 3,171)
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