- Macarthur, PA
- Mackeyville, PA
- Macungie, PA
- Madera, PA
- Madison, PA
- Madison Township, PA
- Madisonburg, PA
- Mahaffey, PA
- Mahanoy City, PA
- Mahanoy Plane, PA
- Mainesburg, PA
- Mainland, PA
- Malvern, PA
- Mammoth, PA
- Manayunk, PA
- Manchester, PA
- Manheim, PA
- Manns Choice, PA
- Manoa, PA
- Manor, PA
- Manorville, PA
- Mansfield, PA
- Maple Glen, PA
- Mapleton Depot, PA
- Mar Lin, PA
- Marble, PA
- Marchand, PA
- Marcus Hook, PA
- Marianna, PA
- Marienville, PA
- Marietta, PA
- Marion Center, PA
- Marion Heights, PA
- Marion, PA
- Markleton, PA
- Markleysburg, PA
- Mars, PA
- Marshalls Creek, PA
- Marsteller, PA
- Martin, PA
- Martindale, PA
- Martins Creek, PA
- Martinsburg, PA
- Marwood, PA
- Mary D, PA
- Marysville, PA
- Masontown, PA
- Matamoras, PA
- Mather, PA
- Mattawana, PA
- Maxatawny, PA
- Mayfield, PA
- Mayport, PA
- Maytown, PA
- McAdoo, PA
- McAlisterville, PA
- McClellandtown, PA
- McClure, PA
- McConelstown, PA
- McConnellsburg, PA
- McConnellstown, PA
- McDonald, PA
- McElhattan, PA
- McEwensville, PA
- McGees Mills, PA
- McGrann, PA
- McIntyre, PA
- McKean, PA
- McKees Rocks, PA
- McKeesport, PA
- McKnight, PA
- McKnightstown, PA
- McMurray, PA
- McSherrystown, PA
- McVeytown, PA
- Meadow Lands, PA
- Meadowbrook, PA
- Meadville, PA
- Mechanicsburg, PA
- Mechanicsville, PA
- Media, PA
- Mehoopany, PA
- Melcroft, PA
- Melrose, PA
- Melrose Park, PA
- Mendenhall, PA
- Menges Mills, PA
- Mentcle, PA
- Mercer, PA
- Mercersburg, PA
- Meridian, PA
- Merion Station, PA
- Merrittstown, PA
- Mertztown, PA
- Meshoppen, PA
- Messiah College, PA
- Mexico, PA
- Meyersdale, PA
- Middle City East, PA
- Middle City West, PA
- Middle Creek, PA
- Middleburg, PA
- Middlebury Center, PA
- Middleport, PA
- Middletown, PA
- Midland, PA
- Midway, PA
- Mifflin, PA
- Mifflinburg, PA
- Mifflintown, PA
- Mifflinville, PA
- Milan, PA
- Milanville, PA
- Mildred, PA
- Milesburg, PA
- Milford, PA
- Milford Square, PA
- Mill Creek, PA
- Mill Hall, PA
- Mill Run, PA
- Mill Village, PA
- Millersburg, PA
- Millerstown, PA
- Millersville, PA
- Millerton, PA
- Millheim, PA
- Millmont, PA
- Millrift, PA
- Mills, PA
- Millsboro, PA
- Millvale, PA
- Millville, PA
- Milmont Park, PA
- Milnesville, PA
- Milroy, PA
- Milton, PA
- Mineral Point, PA
- Mineral Springs, PA
- Miners Mill, PA
- Minersville, PA
- Mingoville, PA
- Minisink Hills, PA
- Miquon, PA
- Mocanaqua, PA
- Modena, PA
- Mohnton, PA
- Mohrsville, PA
- Monaca, PA
- Monessen, PA
- Monocacy Station, PA
- Monongahela, PA
- Monroe Township, PA
- Monroeton, PA
- Monroeville, PA
- Mont Alto, PA
- Mont Clare, PA
- Montandon, PA
- Montgomery, PA
- Montgomeryville, PA
- Montour, PA
- Montoursville, PA
- Montrose, PA
- Moon Township, PA
- Moosic, PA
- Morann, PA
- Morea, PA
- Morgan, PA
- Morgantown, PA
- Morris, PA
- Morris Run, PA
- Morrisdale, PA
- Morrisville, PA
- Morton, PA
- Moscow, PA
- Moshannon, PA
- Mount Aetna, PA
- Mount Bethel, PA
- Mount Braddock, PA
- Mount Carmel, PA
- Mount Cobb, PA
- Mount Gretna, PA
- Mount Holly Springs, PA
- Mount Jewett, PA
- Mount Joy, PA
- Mount Lebanon, PA
- Mount Morris, PA
- Mount Oliver, PA
- Mount Penn, PA
- Mount Pleasant Mills, PA
- Mount Pleasant, PA
- Mount Pocono, PA
- Mount Union, PA
- Mount Washington, PA
- Mount Wolf, PA
- Mountain Top, PA
- Mountainhome, PA
- Mountville, PA
- Moylan, PA
- Muir, PA
- Muncy, PA
- Muncy Valley, PA
- Munhall, PA
- Munson, PA
- Murrysville, PA
- Muse, PA
- Myerstown, PA