# List of places in Pennsylvania: M

This list of cities, towns, unincorporated communities, counties, and other recognized places in the U.S. state of Pennsylvania also includes information on the number and names of counties in which the place lies, and its lower and upper zip code bounds, if applicable.
| Name of place | Number of counties | Principal county | Lower zip code | Upper zip code17752 |
| Mabel | 1 | Schuylkill County | 17921 | |
| Mable Hill | 1 | Greene County | 15327 | |
| Mac | 1 | Bradford County | | |
| Macada | 1 | Northampton County | | |
| MacArthur | 1 | Beaver County | 15001 | |
| Macdonaldton | 1 | Somerset County | 15530 | |
| Macedonia | 1 | Bradford County | 18848 | |
| Macedonia | 1 | Juniata County | 17059 | |
| Mackeyville | 1 | Clinton County | 17750 | |
| Macungie | 1 | Lehigh County | 18062 | |
| Maddensville | 1 | Huntingdon County | 17243 | |
| Madera | 1 | Clearfield County | 16661 | |
| Madge | 1 | Elk County | 16735 | |
| Madison | 1 | Westmoreland County | 15663 | |
| Madison Township | 1 | Armstrong County | | |
| Madison Township | 1 | Clarion County | | |
| Madison Township | 1 | Columbia County | | |
| Madison Township | 1 | Lackawanna County | | |
| Madisonburg | 1 | Centre County | 16852 | |
| Madisonville | 1 | Lackawanna County | 18444 | |
| Madley | 1 | Bedford County | 15534 | |
| Magee | 1 | Warren County | 16351 | |
| Magill Heights | 1 | Allegheny County | 15076 | |
| Magnolia Gardens | 1 | Bucks County | 19007 | |
| Magnolia Hill | 1 | Bucks County | | |
| Mahaffey | 1 | Clearfield County | 15757 | |
| Mahanoy Township | 1 | Schuylkill County | | |
| Mahanoy City | 1 | Schuylkill County | 17948 | |
| Mahanoy Plane | 1 | Schuylkill County | 17949 | |
| Mahantango | 1 | Dauphin County | | |
| Mahoning | 1 | Armstrong County | 16259 | |
| Mahoning | 1 | Fayette County | | |
| Mahoning Township | 1 | Armstrong County | | |
| Mahoning Township | 1 | Carbon County | | |
| Mahoning Township | 1 | Lawrence County | | |
| Mahoning Township | 1 | Montour County | | |
| Mahoningtown | 1 | Lawrence County | 16102 | |
| Maiden Creek | 1 | Berks County | 19606 | |
| Maidencreek Township | 1 | Berks County | | |
| Main Township | 1 | Columbia County | | |
| Mainesburg | 1 | Tioga County | 16932 | |
| Mainland | 1 | Montgomery County | 19451 | |
| Mainsville | 1 | Franklin County | 17257 | |
| Mainville | 1 | Columbia County | 17815 | |
| Maitland | 1 | Mifflin County | 17044 | |
| Maizeville | 1 | Schuylkill County | 17934 | |
| Majeriks Corners | 1 | Erie County | 16441 | |
| Makefield Village | 1 | Bucks County | 19067 | |
| Malden Place | 1 | Washington County | 15417 | |
| Mall | 1 | Allegheny County | 15146 | |
| Malta | 1 | Northumberland County | 17017 | |
| Maltby | 1 | Luzerne County | 18704 | |
| Malvern | 1 | Chester County | 19355 | |
| Mammoth | 1 | Westmoreland County | 15664 | |
| Mamont | 1 | Westmoreland County | 15632 | |
| Manada Gap | 1 | Dauphin County | 17112 | |
| Manadahill | 1 | Dauphin County | | |
| Manatawny | 1 | Berks County | 19547 | |
| Manayunk | 1 | Philadelphia County | 19127 | |
| Mance | 1 | Somerset County | 15552 | |
| Manchester | 1 | Allegheny County | | |
| Manchester | 1 | York County | 17345 | |
| Manchester Township | 1 | Wayne County | | |
| Manchester Township | 1 | York County | | |
| Mandata | 1 | Northumberland County | 17830 | |
| Manhattan | 1 | Tioga County | 16921 | |
| Manheim | 1 | Lancaster County | 17545 | |
| Manheim Township | 1 | Lancaster County | | |
| Manheim Township | 1 | York County | | |
| Manifold | 1 | Washington County | | |
| Manito | 1 | Westmoreland County | 15650 | |
| Manitto Haven | 1 | Westmoreland County | 15681 | |
| Mann Township | 1 | Bedford County | | |
| Manns Choice | 1 | Bedford County | 15550 | |
| Mannsville | 1 | Perry County | 17074 | |
| Manoa | 1 | Delaware County | 19083 | |
| Manoa Heights | 1 | Delaware County | 19083 | |
| Manor | 1 | Indiana County | 15765 | |
| Manor Township | 1 | Armstrong County | | |
| Manor Township | 1 | Lancaster County | | |
| Manor | 1 | Westmoreland County | 15665 | |
| Manor Heights | 1 | Armstrong County | | |
| Manor Hill | 1 | Huntingdon County | 16652 | |
| Manor Hills | 1 | Delaware County | 19051 | |
| Manor Park Terrace | 1 | Armstrong County | 16226 | |
| Manor Ridge | 1 | Lancaster County | 17603 | |
| Manorville | 1 | Armstrong County | 16238 | |
| Manown | 1 | Allegheny County | 15063 | |
| Mansfield | 1 | Tioga County | 16933 | |
| Mansville | 1 | Westmoreland County | | |
| Mantua | 1 | Philadelphia County | | |
| Mantz | 1 | Schuylkill County | | |
| Mantzville | 1 | Schuylkill County | 18211 | |
| Manver | 1 | Indiana County | | |
| Maple | 1 | Washington County | | |
| Maple Beach | 1 | Bucks County | 19007 | |
| Maple Crest | 1 | Chester County | 19341 | |
| Maple Glen | 1 | Montgomery County | 19002 | |
| Maple Glen | 1 | Washington County | 15417 | |
| Maple Grove | 1 | Berks County | 18011 | |
| Maple Grove | 1 | Chester County | 19363 | |
| Maple Grove | 1 | Clarion County | 16248 | |
| Maple Grove | 1 | Columbia County | | |
| Maple Grove | 1 | Fayette County | | |
| Maple Grove | 1 | Wayne County | | |
| Maple Grove Park | 1 | Berks County | 19540 | |
| Maple Hill | 1 | Lycoming County | 17752 | |
| Maple Hill | 1 | Schuylkill County | 17976 | |
| Maple Hill | 1 | Tioga County | | |
| Maple Lake | 1 | Lackawanna County | 18444 | |
| Maple Manor | 1 | Luzerne County | 18201 | |
| Maple Point | 1 | Bucks County | | |
| Maple Ridge | 1 | Somerset County | 15935 | |
| Maple Shade | 1 | Bucks County | 19021 | |
| Maple Shade | 1 | Venango County | | |
| Maple Summit | 1 | Sullivan County | | |
| Mapledale | 1 | Venango County | 16323 | |
| Mapleton | 1 | Huntingdon County | 17052 | |
| Mapleton Depot | 1 | Huntingdon County | 17052 | |
| Mapletown | 1 | Greene County | 15338 | |
| Maplewood | 1 | Bucks County | 18901 | |
| Maplewood | 1 | Wayne County | 18436 | |
| Maplewood Heights | 1 | Luzerne County | 18612 | |
| Maplewood Park | 1 | Delaware County | 19018 | |
| Maplewood Terrace | 1 | Westmoreland County | 15601 | |
| Marble | 1 | Clarion County | 16334 | |
| Marble City | 1 | Bedford County | | |
| Marble Hall | 1 | Montgomery County | 19444 | |
| Marburg | 1 | York County | | |
| Marchand | 1 | Indiana County | 15758 | |
| Marcus Hook | 1 | Delaware County | 19061 | |
| Marcy | 1 | Wyoming County | | |
| Marengo | 1 | Centre County | 16877 | |
| Margaret | 1 | Armstrong County | 16201 | |
| Margaretta Furnace | 1 | York County | 17406 | |
| Margo Gardens | 1 | Bucks County | 19007 | |
| Marguerite | 1 | Westmoreland County | 15650 | |
| Maria | 1 | Bedford County | | |
| Maria Furnace | 1 | Adams County | | |
| Marianna | 1 | Washington County | 15345 | |
| Mariasville | 1 | Venango County | 16373 | |
| Marienville | 1 | Forest County | 16239 | |
| Marietta | 1 | Lancaster County | 17547 | |
| Marion | 1 | Franklin County | 17235 | |
| Marion Center | 1 | Indiana County | 15759 | |
| Marion Heights | 1 | Northumberland County | 17832 | |
| Marion Hill | 1 | Beaver County | 15066 | |
| Marion Township | 1 | Beaver County | | |
| Marion Township | 1 | Berks County | | |
| Marion Township | 1 | Butler County | | |
| Marion Township | 1 | Centre County | | |
| Mark Acres | 1 | Westmoreland County | 15642 | |
| Markelsville | 1 | Perry County | 17074 | |
| Markes | 1 | Franklin County | 17236 | |
| Market Square | 1 | Philadelphia County | 19118 | |
| Market Street | 1 | Chester County | 19380 | |
| Markham | 1 | Delaware County | | |
| Markle | 1 | Westmoreland County | 15613 | |
| Marklesburg | 1 | Huntingdon County | 16657 | |
| Markleton | 1 | Somerset County | 15551 | |
| Markleysburg | 1 | Fayette County | 15459 | |
| Markton | 1 | Jefferson County | 15764 | |
| Markvue Manor | 1 | Westmoreland County | 15642 | |
| Marlboro | 1 | Chester County | 19348 | |
| Marlborough Township | 1 | Montgomery County | | |
| Marlin | 1 | Schuylkill County | 17951 | |
| Marple | 1 | Delaware County | | |
| Marple Township | 1 | Delaware County | | |
| Marple Gardens | 1 | Delaware County | 19008 | |
| Marple Heights | 1 | Delaware County | 19008 | |
| Marple Summit Estates | 1 | Delaware County | 19008 | |
| Marple Township | 1 | Delaware County | 19008 | |
| Marple Woods | 1 | Delaware County | 19008 | |
| Marron | 1 | Clearfield County | 16833 | |
| Mars | 1 | Butler County | 16046 | |
| Marsh | 1 | Chester County | 19520 | |
| Marsh | 1 | Franklin County | 17268 | |
| Marshall Township | 1 | Allegheny County | | |
| Marshall Heights | 1 | Indiana County | 15716 | |
| Marshall Hollow | 1 | Luzerne County | | |
| Marshall Terrace | 1 | Delaware County | 19061 | |
| Marshalls Creek | 1 | Monroe County | 18335 | |
| Marshallton | 1 | Chester County | 19380 | |
| Marshallton | 1 | Northumberland County | 17872 | |
| Marshbrook | 2 | Lackawanna County | 18414 | |
| Marshbrook | 2 | Susquehanna County | 18414 | |
| Marshburg | 1 | McKean County | 16738 | |
| Marsh Creek | 1 | Tioga County | | |
| Marsh Hill | 1 | Lycoming County | 17771 | |
| Marsh Run | 1 | York County | 17070 | |
| Marshlands | 1 | Tioga County | 16921 | |
| Marshview | 1 | Bradford County | 18848 | |
| Marshwood | 1 | Lackawanna County | 18434 | |
| Marsteller | 1 | Cambria County | 15760 | |
| Marstown | 1 | Schuylkill County | 17963 | |
| Martha Furnace | 1 | Centre County | 16844 | |
| Martic Forge | 1 | Lancaster County | 17565 | |
| Martic Township | 1 | Lancaster County | | |
| Marticville | 1 | Lancaster County | 17565 | |
| Martin | 1 | Fayette County | 15460 | |
| Martin | 1 | York County | | |
| Martindale | 1 | Cambria County | 15946 | |
| Martindale | 1 | Lancaster County | 17549 | |
| Martinsburg | 1 | Blair County | 16662 | |
| Martinsburg Junction | 1 | Blair County | 16662 | |
| Martins Corner | 1 | Chester County | 19320 | |
| Martins Creek | 1 | Northampton County | 18063 | |
| Martins Creek Junction | 1 | Northampton County | | |
| Martins Crossroads | 1 | Juniata County | | |
| Martins Ferry | 1 | Greene County | 15338 | |
| Martinsville | 1 | York County | 17366 | |
| Martintown | 1 | Indiana County | | |
| Martzville | 1 | Columbia County | 18603 | |
| Marvel Gardens | 1 | Delaware County | 19094 | |
| Marvindale | 1 | McKean County | 16749 | |
| Marwood | 1 | Butler County | 16023 | |
| Mary D | 1 | Schuylkill County | 17952 | |
| Marysville | 1 | Bedford County | | |
| Marysville | 1 | Centre County | | |
| Marysville | 1 | Perry County | 17053 | |
| Marywood College | 1 | Lackawanna County | 18509 | |
| Mascot | 1 | Clearfield County | | |
| Mascot | 1 | Lancaster County | 17572 | |
| Mason | 1 | Venango County | | |
| Mason and Dixon | 1 | Franklin County | 17225 | |
| Masontown | 1 | Fayette County | 15461 | |
| Masseyburg | 1 | Huntingdon County | 16669 | |
| Mast Hope | 1 | Pike County | 18435 | |
| Masten | 1 | Lycoming County | 17732 | |
| Mastersonville | 1 | Lancaster County | 17545 | |
| Matamoras | 1 | Dauphin County | 17032 | |
| Matamoras | 1 | Pike County | 18336 | |
| Mateer | 1 | Armstrong County | 16226 | |
| Mather | 1 | Greene County | 15346 | |
| Mattawana | 1 | Mifflin County | 17054 | |
| Matternville | 1 | Centre County | | |
| Matterstown | 1 | Dauphin County | | |
| Matthews Run | 1 | Warren County | 16371 | |
| Mattie | 1 | Bedford County | | |
| Mauch Chunk | 1 | Carbon County | | |
| Mauk | 1 | Jefferson County | | |
| Mausdale | 1 | Montour County | 17821 | |
| Maxatawny | 1 | Berks County | 19538 | |
| Maxatawny Township | 1 | Berks County | | |
| Maxwell | 1 | Fayette County | 15450 | |
| Mayberry Township | 1 | Montour County | | |
| Mayburg | 1 | Forest County | 16347 | |
| Mayes | 1 | Clearfield County | | |
| Mayfair | 1 | Northumberland County | | |
| Mayfair | 1 | Philadelphia County | 19136 | |
| Mayfield | 1 | Lackawanna County | 18433 | |
| Mayfield | 1 | Westmoreland County | | |
| Mayfield East | 1 | York County | 17405 | |
| Mayport | 1 | Clarion County | 16240 | |
| Maysville | 1 | Armstrong County | 15618 | |
| Maysville | 1 | Mercer County | 16125 | |
| Maysville | 1 | Northumberland County | 17866 | |
| Maytown | 1 | Lancaster County | 17550 | |
| Maytown | 1 | York County | 17339 | |
| Mayview | 1 | Allegheny County | 15017 | |
| Mayville | 1 | Lawrence County | 16105 | |
| Maze | 1 | Juniata County | 17094 | |
| Mazeppa | 1 | Union County | 17837 | |
| McAdams | 1 | Washington County | | |
| McAdoo | 1 | Schuylkill County | 18237 | |
| McAdoo Heights | 1 | Schuylkill County | 18237 | |
| McAlevys Fort | 1 | Huntingdon County | 16652 | |
| McAlisters Crossroads | 1 | Allegheny County | | |
| McAlisterville | 1 | Juniata County | 17049 | |
| McAuley | 1 | Columbia County | | |
| McBride | 1 | Butler County | | |
| McCafferty Village | 1 | Delaware County | | |
| McCalmont | 1 | Butler County | | |
| McCalmont Township | 1 | Jefferson County | | |
| McCance | 1 | Westmoreland County | 15658 | |
| McCandless Township | 1 | Allegheny County | 15237 | |
| McCartney | 1 | Clearfield County | 16661 | |
| McCartys Corner | 1 | Pike County | | |
| McCaslin | 1 | Lawrence County | | |
| McCauley | 1 | Clarion County | | |
| McCauley | 1 | Clearfield County | 16651 | |
| McChesneytown | 1 | Westmoreland County | 15650 | |
| McChesneytown-Loyalhanna | 1 | Westmoreland County | | |
| McClarran | 1 | Westmoreland County | 15650 | |
| McCleary | 1 | Beaver County | | |
| McClellan | 1 | Dauphin County | 17032 | |
| McClellan Heights | 1 | York County | 17403 | |
| McClellandtown | 1 | Fayette County | 15458 | |
| McClintock | 1 | Venango County | 16301 | |
| McClure | 1 | Fayette County | 15666 | |
| McClure | 1 | Snyder County | 17841 | |
| McConnells Mill | 1 | Lawrence County | | |
| McConnells Mill | 1 | Washington County | 15317 | |
| McConnellsburg | 1 | Fulton County | 17233 | |
| McConnellstown | 1 | Huntingdon County | 16660 | |
| McCormick | 1 | Indiana County | | |
| McCoys Corners | 1 | Mercer County | | |
| McCoysville | 1 | Juniata County | 17058 | |
| McCracken | 1 | Greene County | 26033 | |
| McCracken | 1 | Washington County | | |
| McCrays | 1 | Forest County | | |
| McCrea | 1 | Cumberland County | 17241 | |
| McCrea Furnace | 1 | Armstrong County | | |
| McCullochs Mills | 1 | Juniata County | 17035 | |
| McCullough | 1 | Westmoreland County | 15636 | |
| McDermott | 1 | York County | | |
| McDonald | 2 | Allegheny County | 15057 | |
| McDonald | 2 | Washington County | 15057 | |
| McDowell Corners | 1 | Mercer County | 16127 | |
| McElhattan | 1 | Clinton County | 17748 | |
| McEwensville | 1 | Northumberland County | 17749 | |
| McFann | 1 | Butler County | | |
| McGarey | 1 | Jefferson County | | |
| McGees | 1 | Clearfield County | | |
| McGees Mills | 1 | Clearfield County | 15757 | |
| McGillstown | 1 | Lebanon County | 17038 | |
| McGovern | 1 | Washington County | 15342 | |
| McGrann | 1 | Armstrong County | 16236 | |
| McGregor | 1 | Armstrong County | 16222 | |
| McHaddon | 1 | Armstrong County | | |
| McHenry Township | 1 | Lycoming County | | |
| McIlhaney | 1 | Monroe County | 18322 | |
| McIntyre | 1 | Indiana County | 15756 | |
| McIntyre Township | 1 | Lycoming County | | |
| McKean | 1 | Erie County | 16426 | |
| McKean Township | 1 | Erie County | | |
| McKeansburg | 1 | Schuylkill County | 17960 | |
| McKee | 1 | Blair County | 16637 | |
| McKee | 1 | Perry County | | |
| McKee Half Falls | 1 | Snyder County | 17864 | |
| McKees Rocks | 1 | Allegheny County | 15136 | |
| McKeesport | 1 | Allegheny County | 15130 | 35 |
| McKimm | 1 | Beaver County | | |
| McKinley | 1 | Elk County | | |
| McKinley | 1 | Montgomery County | 19117 | |
| McKinley Hill | 1 | Fayette County | 15474 | |
| McKinney | 1 | Franklin County | 17232 | |
| McKnight | 1 | Allegheny County | 15237 | |
| McKnight Village | 1 | Allegheny County | 15237 | |
| McKnightstown | 1 | Adams County | 17343 | |
| McKnightstown Station | 1 | Adams County | | |
| McLallen Corners | 1 | Erie County | | |
| McLane | 1 | Erie County | 16426 | |
| McLaughlin Corners | 1 | Crawford County | | |
| McMichaels | 1 | Monroe County | 18360 | |
| McMinns Summit | 1 | Jefferson County | | |
| McMurray | 1 | Washington County | 15317 | |
| McNees | 1 | Armstrong County | | |
| McNett Township | 1 | Lycoming County | | |
| McPherron | 1 | Clearfield County | 15753 | |
| McQueston Corners | 1 | Mercer County | 16130 | |
| McSherrystown | 1 | Adams County | 17344 | |
| McSparran | 1 | Lancaster County | 17563 | |
| McVeytown | 1 | Mifflin County | 17051 | |
| McVille | 1 | Armstrong County | 16229 | |
| McWilliams | 1 | Armstrong County | 16242 | |
| Mead Township | 1 | Warren County | | |
| Meade Heights | 1 | Dauphin County | | |
| Meadetown | 1 | York County | | |
| Meadia Heights | 1 | Lancaster County | 17602 | |
| Meadow Gap | 1 | Huntingdon County | 17243 | |
| Meadow Lands | 1 | Washington County | 15347 | |
| Meadow Mill | 1 | Westmoreland County | | |
| Meadow Wood | 1 | Beaver County | 15001 | |
| Meadowbrook | 1 | Fayette County | 15401 | |
| Meadowbrook | 1 | Montgomery County | 19046 | |
| Meadowbrook Manor | 1 | Chester County | 19341 | |
| Meadowdale | 1 | Somerset County | | |
| Meadowleads | 1 | Washington County | | |
| Meadowood | 1 | Butler County | 16045 | |
| Meadowview | 1 | Northumberland County | 17860 | |
| Meadowview Estates | 1 | Lancaster County | 17540 | |
| Meadville | 1 | Crawford County | 16335 | |
| Meadville Junction | 1 | Crawford County | | |
| Mechanics Grove | 1 | Lancaster County | 17566 | |
| Mechanics Valley | 1 | Bucks County | | |
| Mechanicsburg | 1 | Beaver County | | |
| Mechanicsburg | 1 | Cumberland County | 17055 | |
| Mechanicsville | 1 | Bucks County | 18934 | |
| Mechanicsville | 1 | Clarion County | 16214 | |
| Mechanicsville | 1 | Lancaster County | 17545 | |
| Mechanicsville | 1 | Lehigh County | 18104 | |
| Mechanicsville | 1 | Montour County | | |
| Mechanicsville | 1 | Philadelphia County | | |
| Mechanicsville | 1 | Schuylkill County | 17901 | |
| Mechesneytown | 1 | Westmoreland County | | |
| Meckesville | 1 | Carbon County | 18210 | |
| Mecks Corner | 1 | Perry County | 17068 | |
| Meckville | 1 | Berks County | | |
| Media | 1 | Delaware County | 19063 | 86 |
| Medix Run | 1 | Elk County | 15868 | |
| Meeker | 1 | Luzerne County | 18612 | |
| Megargee | 1 | Chester County | 19320 | |
| Meharg | 1 | Butler County | | |
| Mehoopany | 1 | Wyoming County | 18629 | |
| Mehoopany Township | 1 | Wyoming County | | |
| Meiser | 1 | Snyder County | 17842 | |
| Meisertown | 1 | Monroe County | | |
| Meiserville | 1 | Snyder County | 17853 | |
| Melcroft | 1 | Fayette County | 15462 | |
| Mellinger | 1 | Lancaster County | | |
| Mellingertown | 1 | Westmoreland County | 15666 | |
| Mellotts Mill | 1 | Fulton County | | |
| Melrose | 1 | Berks County | 19606 | |
| Melrose | 1 | Fayette County | 15450 | |
| Melrose | 1 | Susquehanna County | 18847 | |
| Melrose Park | 1 | Montgomery County | 19012 | |
| Menallen Township | 1 | Adams County | | |
| Menallen Township | 1 | Fayette County | | |
| Mench | 1 | Bedford County | 15537 | |
| Mendenhall | 1 | Chester County | 19357 | |
| Mendon | 1 | Westmoreland County | 15679 | |
| Menges Mill | 1 | Adams County | | |
| Menges Mills | 1 | York County | 17346 | |
| Menno | 1 | Mifflin County | 17004 | |
| Menno Township | 1 | Mifflin County | 17002 | |
| Mentcle | 1 | Indiana County | 15761 | |
| Mercer | 1 | Mercer County | 16137 | |
| Mercer Township | 1 | Butler County | | |
| Mercersburg | 1 | Franklin County | 17236 | |
| Mercersburg Junction | 1 | Franklin County | 17236 | |
| Mercur | 1 | Bradford County | 18854 | |
| Meredith | 1 | Armstrong County | 16249 | |
| Meredith | 1 | Jefferson County | | |
| Meridian | 1 | Butler County | 16001 | |
| Merion | 1 | Montgomery County | | |
| Merion Golf Manor | 1 | Delaware County | 19003 | |
| Merion Park | 1 | Montgomery County | 19066 | |
| Merion Square | 1 | Montgomery County | 19035 | |
| Merion Station | 1 | Montgomery County | 19066 | |
| Merion View | 1 | Montgomery County | 19406 | |
| Meriwether Farms | 1 | Chester County | 19380 | |
| Merlin | 1 | Chester County | | |
| Merrian | 1 | Northumberland County | 17851 | |
| Merrill | 1 | Beaver County | 15052 | |
| Merrittstown | 1 | Fayette County | 15463 | |
| Merryall | 1 | Bradford County | 18853 | |
| Mertz Town | 1 | Carbon County | | |
| Mertztown | 1 | Berks County | 19539 | |
| Merwin | 1 | Westmoreland County | 15613 | |
| Merwinsburg | 1 | Monroe County | 18330 | |
| Merwood | 1 | Delaware County | 19083 | |
| Meshoppen | 1 | Wyoming County | 18630 | |
| Meshoppen Township | 1 | Wyoming County | | |
| Messiah College | 1 | Cumberland County | 17027 | |
| Messmore | 1 | Fayette County | 15458 | |
| Metal | 1 | Franklin County | 17224 | |
| Metal Township | 1 | Franklin County | | |
| Metamora Station | 1 | Lehigh County | | |
| Metcalf | 1 | Westmoreland County | 15068 | |
| Metzler | 1 | Somerset County | | |
| Mexico | 1 | Juniata County | 17056 | |
| Mexico | 1 | Montour County | | |
| Meyersdale | 1 | Somerset County | 15552 | |
| Meyersville | 1 | Lehigh County | 18104 | |
| Mickleys | 1 | Lehigh County | 18052 | |
| Mickleys Gardens | 1 | Lehigh County | 18052 | |
| Middle Churches | 1 | Westmoreland County | 15666 | |
| Middle City | 1 | Philadelphia County | 19102 | |
| Middle Creek | 1 | Snyder County | 17812 | 17843 |
| Middle Lancaster | 1 | Butler County | 16037 | |
| Middle Paxton Township | 1 | Dauphin County | | |
| Middle Smithfield Township | 1 | Monroe County | | |
| Middle Spring | 1 | Cumberland County | 17257 | |
| Middle Taylor Township | 1 | Cambria County | | |
| Middleboro | 1 | Erie County | | |
| Middleburg | 1 | Franklin County | | |
| Middleburg | 1 | Luzerne County | 18661 | |
| Middleburg | 1 | Snyder County | 17842 | |
| Middlebury | 1 | Tioga County | | |
| Middlebury Center | 1 | Tioga County | 16935 | |
| Middlebury Township | 1 | Tioga County | | |
| Middlecreek Township | 1 | Snyder County | | |
| Middlecreek Township | 1 | Somerset County | | |
| Middleport | 1 | Schuylkill County | 17953 | |
| Middlesex | 1 | Cumberland County | 17013 | |
| Middlesex Township | 1 | Butler County | | |
| Middlesex Township | 1 | Cumberland County | | |
| Middleswarth | 1 | Snyder County | 17842 | |
| Middleton | 1 | Clearfield County | 15757 | |
| Middletown | 1 | Bradford County | | |
| Middletown | 1 | Dauphin County | 17057 | |
| Middletown | 1 | Huntingdon County | | |
| Middletown | 1 | McKean County | | |
| Middletown | 1 | Northampton County | 18017 | |
| Middletown | 1 | Westmoreland County | 15672 | |
| Middletown Center | 1 | Susquehanna County | 18818 | |
| Middletown Heights | 1 | Delaware County | 19063 | |
| Middletown Township | 1 | Bucks County | | |
| Middletown Township | 1 | Delaware County | | |
| Middletown Township | 1 | Susquehanna County | | |
| Midland | 1 | Beaver County | 15059 | |
| Midland | 1 | Washington County | 15342 | |
| Midmont | 1 | Elk County | | |
| Midvale | 1 | Franklin County | | |
| Midvale | 1 | Luzerne County | 18705 | |
| Midvale | 1 | Philadelphia County | | |
| Midvalley | 1 | Columbia County | 17888 | |
| Midway | 1 | Adams County | 17331 | |
| Midway | 1 | Bucks County | | |
| Midway | 1 | Lebanon County | 17042 | |
| Midway | 1 | Washington County | 15060 | |
| Midway | 1 | Westmoreland County | 15601 | |
| Midway Manor | 1 | Lehigh County | 18109 | |
| Miedel Hill | 1 | Westmoreland County | | |
| Mifflin | 1 | Juniata County | 17058 | |
| Mifflin Cross Roads | 1 | Columbia County | | |
| Mifflin Junction | 1 | Allegheny County | 15236 | |
| Mifflin Township | 1 | Columbia County | | |
| Mifflin Township | 1 | Dauphin County | | |
| Mifflin Township | 1 | Lycoming County | | |
| Mifflinburg | 1 | Union County | 17844 | |
| Mifflintown | 1 | Juniata County | 17059 | |
| Mifflinville | 1 | Columbia County | 18631 | |
| Milan | 1 | Bradford County | 18831 | |
| Milanville | 1 | Wayne County | 18443 | |
| Milbell | 1 | Westmoreland County | | |
| Mildred | 1 | Sullivan County | 18632 | |
| Mile Run | 1 | Northumberland County | 17801 | |
| Miles Township | 1 | Centre County | | |
| Milesburg | 1 | Centre County | 16853 | |
| Milesville | 1 | Allegheny County | 15063 | |
| Milford | 1 | Pike County | 18337 | |
| Milford Manor | 1 | Bucks County | 19067 | |
| Milford Mills | 1 | Chester County | | |
| Milford Park | 1 | Lehigh County | | |
| Milford Square | 1 | Bucks County | 18935 | |
| Milford Township | 1 | Bucks County | | |
| Milford Township | 1 | Juniata County | | |
| Milford Township | 1 | Pike County | | |
| Milford Township | 1 | Somerset County | | |
| Milfred Terrace | 1 | Washington County | 15348 | |
| Militia Hill | 1 | Montgomery County | 19034 | |
| Mill City | 1 | Wyoming County | 18414 | |
| Mill Creek | 1 | Elk County | | |
| Mill Creek | 1 | Huntingdon County | 17060 | |
| Mill Creek | 1 | Schuylkill County | 17901 | |
| Mill Creek | 1 | Tioga County | | |
| Mill Creek Falls | 1 | Bucks County | | |
| Mill Creek Township | 1 | Lycoming County | | |
| Mill Creek Township | 1 | Mercer County | | |
| Mill Grove | 1 | Columbia County | 17820 | |
| Mill Grove | 1 | Westmoreland County | | |
| Mill Hall | 1 | Clinton County | 17751 | |
| Mill Lane | 1 | Chester County | | |
| Mill Park | 1 | Montgomery County | 19464 | |
| Mill Road | 1 | Montgomery County | | |
| Mill Run | 1 | Blair County | 16001 | |
| Mill Run | 1 | Clearfield County | 15849 | |
| Mill Run | 1 | Fayette County | 15464 | |
| Mill Run Junction | 1 | Fayette County | | |
| Mill Village | 1 | Erie County | 16427 | |
| Millardsville | 1 | Lebanon County | 17067 | |
| Millbach | 1 | Lebanon County | 17073 | |
| Millbach Springs | 1 | Lebanon County | 17073 | |
| Millbank | 1 | Delaware County | 19082 | |
| Millbank | 1 | Westmoreland County | 15658 | |
| Millbourne | 1 | Delaware County | 19082 | |
| Millbrook | 1 | Centre County | 16801 | |
| Millbrook | 1 | Mercer County | 16133 | |
| Millburn | 1 | Mercer County | | |
| Millcreek Township | 1 | Clarion County | | |
| Millcreek Township | 1 | Erie County | | |
| Millcreek Township | 1 | Lebanon County | | |
| Milledgeville | 1 | Mercer County | 16311 | |
| Miller Heights | 1 | Northampton County | 18017 | |
| Miller Manor | 1 | Northampton County | 18067 | |
| Miller Run | 1 | Somerset County | 15936 | |
| Miller Shaft | 1 | Cambria County | 15946 | |
| Miller Township | 1 | Huntingdon County | | |
| Miller Township | 1 | Perry County | | |
| Millers | 1 | Crawford County | 16403 | |
| Millers | 1 | Northampton County | | |
| Millers | 1 | Schuylkill County | | |
| Millers Crossroads | 1 | Northumberland County | | |
| Millers Station | 1 | Crawford County | | |
| Millersburg | 1 | Dauphin County | 17061 | |
| Millersdale | 1 | Westmoreland County | | |
| Millerstown | 1 | Allegheny County | 15084 | |
| Millerstown | 1 | Blair County | 16662 | |
| Millerstown | 1 | Clarion County | 16334 | |
| Millerstown | 1 | Perry County | 17062 | |
| Millersville | 1 | Lancaster County | 17551 | |
| Millerton | 1 | Tioga County | 16936 | |
| Millertown | 1 | Columbia County | | |
| Millertown | 1 | Fayette County | 15446 | |
| Millheim | 1 | Centre County | 16854 | |
| Milligantown | 1 | Westmoreland County | 15069 | |
| Millikens | 1 | Clearfield County | | |
| Millmont | 1 | Berks County | | |
| Millmont | 1 | Union County | 17845 | |
| Millport | 1 | Lancaster County | 17540 | |
| Millport | 1 | Potter County | 16748 | |
| Millrift | 1 | Pike County | 18340 | |
| Mills | 1 | Potter County | 16937 | |
| Millsboro | 1 | Washington County | 15348 | |
| Millstone | 1 | Elk County | | |
| Millstone Township | 1 | Elk County | | |
| Milltown | 1 | Allegheny County | | |
| Milltown | 1 | Bradford County | 18840 | |
| Milltown | 1 | Chester County | 19380 | |
| Milltown | 1 | Perry County | | |
| Milltown | 1 | Warren County | | |
| Millvale | 1 | Allegheny County | 15209 | |
| Millview | 1 | Sullivan County | 18616 | |
| Millville | 1 | Columbia County | 17846 | |
| Millway | 1 | Lancaster County | 17543 | |
| Millwood | 1 | Westmoreland County | 15627 | |
| Milmont | 1 | Delaware County | | |
| Milmont Park | 1 | Delaware County | 19033 | |
| Milnesville | 1 | Luzerne County | 18239 | |
| Milnor | 1 | Franklin County | 17225 | |
| Milroy | 1 | Mifflin County | 17063 | |
| Milton | 1 | Armstrong County | 16222 | |
| Milton | 1 | Northumberland County | 17847 | |
| Milton Grove | 1 | Lancaster County | 17552 | |
| Milwaukee | 1 | Lackawanna County | 18411 | |
| Mina | 1 | Potter County | 16915 | |
| Mineral Point | 1 | Cambria County | 15942 | |
| Mineral Spring | 1 | Somerset County | | |
| Mineral Springs | 1 | Clearfield County | 16855 | |
| Mineral Township | 1 | Venango County | | |
| Miners Mills | 1 | Luzerne County | | |
| Miners Village | 1 | Lebanon County | 17016 | |
| Minersville | 1 | Cambria County | | |
| Minersville | 1 | Schuylkill County | 17954 | |
| Minerville | 1 | Bradford County | | |
| Minesite | 1 | Lehigh County | 18103 | |
| Mingo | 1 | Montgomery County | | |
| Mingoville | 1 | Centre County | 16856 | |
| Minisink Hills | 1 | Monroe County | 18341 | |
| Minister | 1 | Forest County | | |
| Minnequa | 1 | Bradford County | | |
| Minooka | 1 | Lackawanna County | | |
| Mintzers | 1 | Schuylkill County | | |
| Miola | 1 | Clarion County | 16214 | |
| Miquon | 1 | Montgomery County | 19452 | |
| Miquon Hills | 1 | Montgomery County | 19428 | |
| Misertown | 1 | Monroe County | 18332 | |
| Mishler Corners | 1 | Erie County | | |
| Mission Hill | 1 | Lancaster County | 17601 | |
| Mitchell Creek | 1 | Tioga County | | |
| Mitchell Park | 1 | Montgomery County | 19040 | |
| Mitchells | 1 | Clearfield County | | |
| Mix Run | 1 | Cameron County | 15832 | |
| Mixtown | 1 | Tioga County | | |
| Mocanaqua | 1 | Luzerne County | 18655 | |
| Mocking Bird Hill | 1 | Westmoreland County | 15642 | |
| Model Village | 1 | Delaware County | 19061 | |
| Modena | 1 | Chester County | 19358 | |
| Moffitt Sterling | 1 | Greene County | | |
| Moffitty | 1 | Greene County | 15327 | |
| Mogees | 1 | Montgomery County | 19401 | |
| Mogees Station | 1 | Montgomery County | | |
| Mogeetown | 1 | Montgomery County | | |
| Mohns Hill | 1 | Berks County | 19608 | |
| Mohnton | 1 | Berks County | 19540 | |
| Mohrsville | 1 | Berks County | 19541 | |
| Moline | 1 | Westmoreland County | | |
| Molino | 1 | Schuylkill County | 17961 | |
| Mollenauer | 1 | Allegheny County | 15102 | |
| Molltown | 1 | Berks County | 19522 | |
| Monaca | 1 | Beaver County | 15061 | |
| Monaghan Township | 1 | York County | | |
| Monarch | 1 | Fayette County | 15431 | |
| Monessen | 1 | Westmoreland County | 15062 | |
| Mongul | 1 | Franklin County | 17257 | |
| Moninger | 1 | Washington County | 15342 | |
| Moniteau | 1 | Butler County | 16061 | |
| Monocacy | 1 | Berks County | | |
| Monocacy Station | 1 | Berks County | 19542 | |
| Monongahela | 1 | Washington County | 15063 | |
| Monongahela Junction | 1 | Allegheny County | 15110 | |
| Monongahela Township | 1 | Greene County | | |
| Monroe | 1 | Bradford County | 18832 | |
| Monroe | 1 | Bucks County | 18930 | |
| Monroe | 1 | Butler County | | |
| Monroe | 1 | Clarion County | 16232 | |
| Monroe Furnace | 1 | Huntingdon County | | |
| Monroe Heights | 1 | Allegheny County | 15146 | |
| Monroe Township | 1 | Bedford County | | |
| Monroe Township | 1 | Bradford County | | |
| Monroe Township | 1 | Clarion County | | |
| Monroe Township | 1 | Cumberland County | | |
| Monroe Township | 1 | Juniata County | | |
| Monroe Township | 1 | Snyder County | | |
| Monroe Township | 1 | Wyoming County | | |
| Monroeton | 1 | Bradford County | 18832 | |
| Monroeville | 1 | Allegheny County | 15146 | |
| Mont Alto | 1 | Franklin County | 17237 | |
| Mont Clare | 1 | Montgomery County | 19453 | |
| Montandon | 1 | Northumberland County | 17850 | |
| Montdale | 1 | Lackawanna County | 18447 | |
| Montebello | 1 | Perry County | 17020 | |
| Montello | 1 | Berks County | 19608 | |
| Monterey | 1 | Berks County | 19530 | |
| Monterey | 1 | Franklin County | 17214 | |
| Monterey | 1 | Lancaster County | 17540 | |
| Montgomery | 1 | Lycoming County | 17752 | |
| Montgomery Ferry | 1 | Perry County | 17074 | |
| Montgomery Square | 1 | Montgomery County | 18936 | |
| Montgomery Township | 1 | Franklin County | | |
| Montgomery Township | 1 | Indiana County | | |
| Montgomery Township | 1 | Montgomery County | | |
| Montgomeryville | 1 | Armstrong County | | |
| Montgomeryville | 1 | Montgomery County | 18936 | |
| Montmorenci | 1 | Elk County | 15853 | |
| Montour | 1 | Allegheny County | 15244 | |
| Montour Junction | 1 | Allegheny County | 15108 | |
| Montour Township | 1 | Columbia County | | |
| Montoursville | 1 | Lycoming County | 17754 | |
| Montrose | 1 | Berks County | 19607 | |
| Montrose | 1 | Susquehanna County | 18801 | |
| Montrose Hill | 1 | Allegheny County | 15238 | |
| Montsera | 1 | Cumberland County | 17013 | |
| Monument | 1 | Centre County | 16822 | |
| Monvue | 1 | Fayette County | 15461 | |
| Moon | 1 | Allegheny County | 15108 | |
| Moon Crest | 1 | Allegheny County | 15108 | |
| Moon Run | 1 | Allegheny County | 15136 | |
| Moon Township | 1 | Allegheny County | | |
| Moonstown | 1 | Lebanon County | 17073 | |
| Moore | 1 | Delaware County | | |
| Moore Township | 1 | Northampton County | | |
| Mooredale | 1 | Cumberland County | 17013 | |
| Moores Corners | 1 | Butler County | 16057 | |
| Mooresburg | 1 | Montour County | 17821 | |
| Moorestown | 1 | Northampton County | 18014 | |
| Moorhead | 1 | Erie County | | |
| Moorheadville | 1 | Erie County | 16428 | |
| Moors Mill | 1 | Cumberland County | | |
| Moosehead | 1 | Luzerne County | | |
| Moosic | 1 | Lackawanna County | 18507 | |
| Morado | 1 | Beaver County | 15010 | |
| Morann | 1 | Clearfield County | 16663 | |
| Moravia | 1 | Lawrence County | 16157 | |
| Moravian | 1 | Northampton County | 18018 | |
| Mordansville | 1 | Columbia County | 17815 | |
| Morea | 1 | Schuylkill County | | |
| Morea Colliery | 1 | Schuylkill County | 17948 | |
| Morea-New Boston | 1 | Schuylkill County | | |
| Moreland | 1 | Lycoming County | 17756 | |
| Moreland Farms | 1 | Montgomery County | 19040 | |
| Moreland Manor | 1 | Montgomery County | 19040 | |
| Moreland Township | 1 | Lycoming County | | |
| Morewood | 1 | Montgomery County | 19040 | |
| Morewood | 1 | Westmoreland County | | |
| Morford | 1 | Greene County | | |
| Morgan | 1 | Allegheny County | 15064 | |
| Morgan | 1 | Fayette County | 15425 | 15456 |
| Morgan Hill | 1 | Allegheny County | 15031 | |
| Morgan Township | 1 | Greene County | | |
| Morgans Hill | 1 | Northampton County | 18042 | |
| Morgans Land | 1 | Clearfield County | | |
| Morgantown | 1 | Berks County | 19543 | |
| Morganza | 1 | Washington County | | |
| Morningside | 1 | Allegheny County | | |
| Morrell | 1 | Fayette County | 15431 | |
| Morrellville | 1 | Cambria County | | |
| Morris | 1 | Tioga County | 16938 | |
| Morris Crossroads | 1 | Fayette County | 15451 | |
| Morris Run | 1 | Tioga County | 16939 | |
| Morris Township | 1 | Clearfield County | | |
| Morris Township | 1 | Greene County | | |
| Morris Township | 1 | Huntingdon County | | |
| Morris Township | 1 | Tioga County | | |
| Morris Township | 1 | Washington County | | |
| Morrisdale | 1 | Clearfield County | 16858 | |
| Morrisville | 1 | Bucks County | 19067 | |
| Morrisville | 1 | Greene County | 15370 | |
| Morrows Corner | 1 | Armstrong County | 16210 | |
| Morstein | 1 | Chester County | 19380 | |
| Morton | 1 | Delaware County | 19070 | |
| Mortonville | 1 | Chester County | 19320 | |
| Morwood | 1 | Montgomery County | 18969 | |
| Morysville | 1 | Berks County | 19512 | |
| Moscow | 1 | Lackawanna County | 18444 | |
| Moselem | 1 | Berks County | 19526 | |
| Moselem Springs | 1 | Berks County | 19522 | |
| Mosgrove | 1 | Armstrong County | 16259 | |
| Moshannon | 1 | Cambria County | | |
| Moshannon | 1 | Centre County | 16859 | |
| Mosherville | 1 | Bradford County | 16925 | |
| Mosiertown | 1 | Crawford County | 16433 | |
| Moss Creek | 1 | Cambria County | | |
| Moss Creek Junction | 1 | Cambria County | | |
| Moss Plan | 1 | Beaver County | 15074 | |
| Mosserville | 1 | Lehigh County | 18066 | |
| Mossville | 1 | Luzerne County | | |
| Mostoller | 1 | Somerset County | 15563 | |
| Mottarns Mill | 1 | Indiana County | | |
| Moudy Hill | 1 | Cambria County | 15946 | |
| Moulstown | 1 | York County | 17331 | |
| Mount Aetna | 1 | Berks County | 19544 | |
| Mount Air | 1 | Lawrence County | | |
| Mount Airy | 1 | Berks County | | |
| Mount Airy | 1 | Clarion County | 16255 | |
| Mount Airy | 1 | Lancaster County | 17557 | 17578 |
| Mount Airy | 1 | Philadelphia County | 19119 | |
| Mount Airy Terrace | 1 | Luzerne County | 18708 | |
| Mount Allen | 1 | Cumberland County | 17055 | |
| Mount Alton | 1 | McKean County | 16738 | |
| Mount Ararat | 1 | Lebanon County | | |
| Mount Bethel | 1 | Northampton County | 18343 | |
| Mount Braddock | 1 | Fayette County | 15465 | |
| Mount Carbon | 1 | Schuylkill County | 17901 | |
| Mount Carmel | 1 | Greene County | | |
| Mount Carmel | 1 | Northumberland County | 17851 | |
| Mount Carmel Junction | 1 | Northumberland County | | |
| Mount Carmel Township | 1 | Northumberland County | | |
| Mount Chestnut | 1 | Butler County | 16002 | |
| Mount Chestnut Springs | 1 | Butler County | 16001 | |
| Mount Cobb | 1 | Lackawanna County | 18436 | |
| Mount Dallas | 1 | Bedford County | | |
| Mount Eagle | 1 | Centre County | 16841 | |
| Mount Etna | 1 | Blair County | 16693 | |
| Mount Gretna | 1 | Lebanon County | 17064 | |
| Mount Gretna Heights | 1 | Lebanon County | 17064 | |
| Mount Herman | 1 | Washington County | | |
| Mount Holly Springs | 1 | Cumberland County | 17065 | |
| Mount Hope | 1 | Adams County | 17320 | |
| Mount Hope | 1 | Clearfield County | | |
| Mount Hope | 1 | Crawford County | | |
| Mount Hope | 1 | Fayette County | | |
| Mount Hope | 1 | Lancaster County | 17545 | |
| Mount Independence | 1 | Fayette County | 15456 | |
| Mount Jackson | 1 | Lawrence County | 16101 | |
| Mount Jewett | 1 | McKean County | 16740 | |
| Mount Joy | 1 | Clearfield County | 16830 | |
| Mount Joy | 1 | Lancaster County | 17552 | |
| Mount Joy | 1 | Westmoreland County | 15666 | |
| Mount Joy Township | 1 | Adams County | | |
| Mount Joy Township | 1 | Lancaster County | | |
| Mount Laffee | 1 | Schuylkill County | 17901 | |
| Mount Laurel | 1 | Luzerne County | 18201 | |
| Mount Lebanon | 1 | Allegheny County | 15228 | |
| Mount Misery | 1 | Adams County | 17350 | |
| Mount Morris | 1 | Greene County | 15349 | |
| Mount Nebo | 1 | Allegheny County | 15143 | |
| Mount Nebo | 1 | Lancaster County | 17565 | |
| Mount Nebo | 1 | Westmoreland County | | |
| Mount Oliver | 1 | Allegheny County | 15210 | |
| Mount Patrick | 1 | Perry County | 17045 | |
| Mount Penn | 1 | Berks County | 19606 | |
| Mount Pleasant | 1 | Adams County | 17331 | |
| Mount Pleasant | 1 | Berks County | 19506 | |
| Mount Pleasant | 1 | Bucks County | | |
| Mount Pleasant | 1 | Delaware County | 19087 | |
| Mount Pleasant | 1 | Juniata County | 17059 | |
| Mount Pleasant | 1 | Lancaster County | | |
| Mount Pleasant | 1 | Lebanon County | 17042 | |
| Mount Pleasant | 1 | Mifflin County | 17063 | |
| Mount Pleasant | 1 | Northampton County | 18013 | |
| Mount Pleasant | 1 | Northumberland County | | |
| Mount Pleasant | 1 | Perry County | 17006 | |
| Mount Pleasant | 1 | Schuylkill County | 17901 | |
| Mount Pleasant | 1 | Tioga County | 16938 | |
| Mount Pleasant | 1 | York County | 17019 | |
| Mount Pleasant Mills | 1 | Snyder County | 17853 | |
| Mount Pleasant Township | 1 | Adams County | | |
| Mount Pleasant Township | 1 | Columbia County | | |
| Mount Pleasant Township | 1 | Washington County | | |
| Mount Pleasant Township | 1 | Wayne County | | |
| Mount Pleasant | 1 | Westmoreland County | 15666 | |
| Mount Pleasant Township | 1 | Westmoreland County | | |
| Mount Pocono | 1 | Monroe County | 18344 | |
| Mount Rock | 1 | Cumberland County | 17013 | |
| Mount Rock | 1 | Franklin County | 17257 | |
| Mount Rock | 1 | Mifflin County | 17044 | |
| Mount Royal | 1 | York County | 17315 | |
| Mount Sterling | 1 | Fayette County | 15461 | |
| Mount Tabor | 1 | Adams County | 17324 | |
| Mount Tabor | 1 | Armstrong County | | |
| Mount Top | 1 | York County | | |
| Mount Troy | 1 | Allegheny County | 15212 | |
| Mount Union | 1 | Franklin County | 17222 | |
| Mount Union | 1 | Huntingdon County | 17066 | |
| Mount Vernon | 1 | Allegheny County | 15135 | |
| Mount Vernon | 1 | Chester County | 19363 | |
| Mount Vernon | 1 | Lancaster County | 17527 | |
| Mount Vernon | 1 | Westmoreland County | | |
| Mount Washington | 1 | Allegheny County | 15211 | |
| Mount Washington | 1 | Beaver County | 15010 | |
| Mount Washington | 1 | Fayette County | 15437 | |
| Mount Wilson | 1 | Lebanon County | 17042 | |
| Mount Wolf | 1 | York County | 17347 | |
| Mount Zion | 1 | Cumberland County | 17055 | |
| Mount Zion | 1 | Lebanon County | 17042 | |
| Mount Zion | 1 | Luzerne County | 18643 | |
| Mount Zion | 1 | Monroe County | 18301 | |
| Mount Zion | 1 | York County | 17402 | |
| Mountain Green | 1 | Franklin County | | |
| Mountain Grove | 1 | Luzerne County | 17815 | |
| Mountain Lake | 1 | Bradford County | 18848 | |
| Mountain Park | 1 | Luzerne County | | |
| Mountain Top | 1 | Luzerne County | 18707 | |
| Mountaindale | 1 | Cambria County | 16639 | |
| Mountainhome | 1 | Monroe County | 18342 | |
| Mountaintop | 1 | Lancaster County | | |
| Mountainville | 1 | Lehigh County | | |
| Mountville | 1 | Lancaster County | 17554 | |
| Moween | 1 | Westmoreland County | 15681 | |
| Mowersville | 1 | Franklin County | 17257 | |
| Mowry | 1 | Clearfield County | | |
| Mowry | 1 | Schuylkill County | 17921 | |
| Moxham | 1 | Cambria County | | |
| Moyer | 1 | Fayette County | 15425 | |
| Moyers | 1 | Schuylkill County | | |
| Moyers Grove | 1 | Luzerne County | | |
| Moylan | 1 | Delaware County | 19065 | |
| Mozart | 1 | Bucks County | 18925 | |
| Mud Run | 1 | Carbon County | | |
| Muddy Creek Forks | 1 | York County | 17302 | |
| Muddy Creek Township | 1 | Butler County | | |
| Muff | 1 | Armstrong County | | |
| Muhlenberg | 1 | Luzerne County | 18621 | |
| Muhlenberg Park | 1 | Berks County | 19605 | |
| Muhlenberg Township | 1 | Berks County | 19605 | |
| Muir | 1 | Schuylkill County | 17957 | |
| Mullertown | 1 | York County | 17331 | |
| Mumbauersville | 1 | Bucks County | 18073 | |
| Mummasburg | 1 | Adams County | 17325 | |
| Muncy | 1 | Lycoming County | 17756 | |
| Muncy Creek Township | 1 | Lycoming County | | |
| Muncy Township | 1 | Lycoming County | | |
| Muncy Valley | 1 | Sullivan County | 17758 | |
| Munderf | 1 | Jefferson County | 15825 | |
| Mundys Corner | 1 | Cambria County | 15909 | |
| Munhall | 1 | Allegheny County | 15120 | |
| Munhall Terrace | 1 | Allegheny County | 15122 | |
| Munntown | 1 | Washington County | 15330 | |
| Munson | 1 | Clearfield County | 16860 | |
| Munster | 1 | Cambria County | 15940 | |
| Munster Township | 1 | Cambria County | | |
| Murdock | 1 | Somerset County | 15501 | |
| Murdocksville | 3 | Allegheny County | 15026 | |
| Murdocksville | 3 | Beaver County | 15026 | |
| Murdocksville | 3 | Washington County | 15026 | |
| Murphy Siding | 1 | Fayette County | 15425 | |
| Murray | 1 | Lebanon County | | |
| Murray | 1 | Sullivan County | | |
| Murraysville | 1 | Westmoreland County | | |
| Murrell | 1 | Lancaster County | 17522 | |
| Murrinsville | 1 | Butler County | 16020 | |
| Murry Hill | 1 | Washington County | 15317 | |
| Murrysville | 1 | Westmoreland County | 15668 | |
| Muse | 1 | Washington County | 15350 | |
| Musselman Grove | 1 | Blair County | | |
| Musser | 1 | Centre County | | |
| Mustard | 1 | Allegheny County | 15037 | |
| Mutual | 1 | Westmoreland County | 15601 | |
| Muzette | 1 | Forest County | | |
| Myersbrook | 1 | Westmoreland County | | |
| Myersburg | 1 | Bradford County | 18854 | |
| Myerstown | 1 | Lebanon County | 17067 | |
| Mylo Park | 1 | Cambria County | 15931 | |
| Myobeach | 1 | Wyoming County | 18630 | |
| Myoma | 1 | Butler County | 16046 | |
| Myrtle | 1 | McKean County | 14721 | |
| Mystic | 1 | Erie County | 16403 | |
| Mystic Park | 1 | Crawford County | | |