Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Allegheny River Lock and Dam Four | Dam | 227 | Allegheny | 40 36 54 N | 079 43 05 W |
| Allegheny River Lock and Dam Nine | Dam | 244 | Armstrong | 40 57 18 N | 079 32 53 W |
| Allegheny River Lock and Dam Seven | Dam | 234 | Armstrong | 40 49 06 N | 079 31 41 W |
| Allegheny River Lock and Dam Six | Dam | 234 | Armstrong | 40 43 00 N | 079 34 47 W |
| Allegheny River Lock and Dam Three | Dam | 225 | Allegheny | 40 32 18 N | 079 48 53 W |
| Allegheny River Lock and Dam Two | Dam | 252 | Allegheny | 40 29 12 N | 079 54 53 W |
| Allegheny River Pool Eight | Reservoir | 238 | Armstrong | 40 53 42 N | 079 28 41 W |
| Allegheny River Pool Five | Reservoir | 227 | Armstrong | 40 41 00 N | 079 39 59 W |
| Allegheny River Pool Four | Reservoir | 227 | Allegheny | 40 36 54 N | 079 43 05 W |
| Allegheny River Pool Nine | Reservoir | 244 | Armstrong | 40 57 18 N | 079 32 53 W |
| Allegheny River Pool Seven | Reservoir | 234 | Armstrong | 40 49 06 N | 079 31 41 W |
| Allegheny River Pool Six | Reservoir | 234 | Armstrong | 40 43 00 N | 079 34 47 W |
| Allegheny River Pool Three | Reservoir | 225 | Allegheny | 40 32 18 N | 079 48 53 W |
| Allegheny River Pool Two | Reservoir | 252 | Allegheny | 40 29 12 N | 079 54 53 W |
| Allegheny Springs | Populated Place | 435 | Warren | 41 49 36 N | 079 18 14 W |
| Allegheny Square | Park | 6 | Philadelphia | 39 59 10 N | 075 06 12 W |
| Allegheny Tunnel | Tunnel | 797 | Somerset | 39 57 42 N | 078 51 29 W |
| Allegheny Valley Camp | Locale | 286 | Venango | 41 13 32 N | 079 43 41 W |
| Allegheny Valley Hospital | Hospital | 300 | Allegheny | 40 37 03 N | 079 44 15 W |
| Allegheny Valley School | School | 109 | Lebanon | 40 13 53 N | 076 42 55 W |
| Allegheny West | Populated Place | 39 | Philadelphia | 40 00 30 N | 075 10 41 W |
| Alleghenyville | Populated Place | 171 | Berks | 40 14 03 N | 075 59 19 W |
| Alleghenyville Church | Church | 154 | Berks | 40 14 06 N | 075 58 17 W |
| Allegrippis Ridge | Ridge | 380 | Huntingdon | 40 20 39 N | 078 09 39 W |
| Allegrippus | Locale | 610 | Blair | 40 28 36 N | 078 30 59 W |
| Allemans | Populated Place | 539 | Clearfield | 40 43 36 N | 078 24 14 W |
| Allen | Populated Place | 156 | Cumberland | 40 09 55 N | 077 05 04 W |
| Allen | Populated Place | 672 | McKean | 41 52 58 N | 078 34 23 W |
| Allen Bridge | Bridge | 361 | Indiana | 40 37 42 N | 079 03 33 W |
| Allen Corners | Locale | 464 | Venango | 41 14 36 N | 079 58 11 W |
| Allen Creek | Stream | | Somerset | 39 59 07 N | 079 15 39 W |
| Allen Field | Park | 123 | York | 39 58 21 N | 076 42 38 W |
| Allen Gap | Gap | 486 | Snyder | 40 42 05 N | 077 10 37 W |
| Allen Grove Camp | Locale | 128 | Juniata | 40 32 22 N | 077 21 02 W |
| Allen Junction | Locale | 71 | Lehigh | 40 37 46 N | 075 23 19 W |
| Allen Junction | Populated Place | 93 | Lehigh | 40 37 55 N | 075 23 27 W |
| Allen Junior High School | School | 121 | Cumberland | 40 12 55 N | 076 57 01 W |
| Allen Lane | Populated Place | 99 | Philadelphia | 40 03 23 N | 075 11 51 W |
| Allen Run | Stream | | Fayette | 39 59 32 N | 079 45 48 W |
| Allen Run | Stream | | Indiana | 40 37 37 N | 079 03 28 W |
| Allen School | School | 352 | Allegheny | 40 25 23 N | 079 59 40 W |
| Allen School (historical) | School | 465 | Crawford | 41 45 54 N | 080 03 05 W |
| Allen School (historical) | School | 540 | Jefferson | 41 12 08 N | 078 55 07 W |
| Allen Station (historical) | Locale | 483 | Jefferson | 41 12 00 N | 078 54 27 W |
| Allen Street Shopping Center | Locale | 107 | Lehigh | 40 36 26 N | 075 29 22 W |
| Allen Trail | Trail | 385 | Fulton | 40 02 34 N | 077 53 39 W |
| Allen Union Cemetery | Cemetery | 107 | Lehigh | 40 40 20 N | 075 28 49 W |
| Allenberry Playhouse | Building | 160 | Cumberland | 40 09 03 N | 077 06 54 W |
| Allendale | Populated Place | 536 | Cambria | 40 19 07 N | 078 43 31 W |
| Allendale | Populated Place | 114 | Cumberland | 40 13 26 N | 076 53 25 W |
| Allendale Cemetery | Cemetery | 355 | Beaver | 40 43 40 N | 080 16 09 W |
| Allender Run | Stream | | Venango | 41 30 23 N | 079 35 41 W |
| Allenport | Populated Place | 177 | Huntingdon | 40 22 25 N | 077 52 12 W |
| Allenport | Populated Place | 241 | Washington | 40 05 53 N | 079 50 56 W |
| Allenport Hollow | Valley | | Washington | 40 06 05 N | 079 50 44 W |
| Allens | Populated Place | 153 | Lycoming | 41 14 31 N | 076 58 46 W |
| Allens Crossroads | Populated Place | 282 | Westmoreland | 40 08 10 N | 079 50 34 W |
| Allens Mills | Populated Place | 483 | Jefferson | 41 11 58 N | 078 54 27 W |
| Allens Valley | Valley | | Fulton | 40 03 57 N | 077 52 52 W |
| Allensville | Populated Place | 295 | Mifflin | 40 32 09 N | 077 49 01 W |
| Allensville Post Office (historical) | Post Office | 299 | Mifflin | 40 32 03 N | 077 49 11 W |
| Allentown | Populated Place | 103 | Lehigh | 40 36 30 N | 075 29 25 W |
| Allentown (subdivision) | Populated Place | 272 | Allegheny | 40 25 39 N | 079 59 38 W |
| Allentown and Sacred Heart Hospital Center Airport | Airport | 123 | Lehigh | 40 33 58 N | 075 31 19 W |
| Allentown Golf Course | Locale | 114 | Lehigh | 40 35 54 N | 075 32 35 W |
| Allentown High School | School | 84 | Lehigh | 40 36 31 N | 075 28 03 W |
| Allentown High School | School | 88 | Lehigh | 40 36 28 N | 075 27 08 W |
| Allentown Plaza | Locale | 110 | Lehigh | 40 38 33 N | 075 29 23 W |
| Allentown Queen City Municipal Airport | Airport | 116 | Lehigh | 40 34 13 N | 075 29 18 W |
| Allentown Shopping Plaza | Locale | 107 | Lehigh | 40 37 08 N | 075 26 05 W |
| Allentown State Hospital | Hospital | 137 | Lehigh | 40 36 54 N | 075 25 46 W |
| Allentown-Bethlehem-Easton Airport | Airport | 186 | Lehigh | 40 30 11 N | 075 26 23 W |
| Allenvale | Populated Place | 665 | Somerset | 40 04 48 N | 079 08 31 W |
| Allenview | Populated Place | 183 | Cumberland | 40 10 42 N | 076 58 11 W |
| Allenwood | Populated Place | 147 | Union | 41 06 27 N | 076 53 54 W |
| Allenwood Prison Camp | Locale | 193 | Union | 41 09 10 N | 076 55 47 W |
| Alleyne Church | Church | 30 | Philadelphia | 39 58 19 N | 075 13 51 W |
| Alliance Church | Church | 272 | Allegheny | 40 34 44 N | 079 58 05 W |
| Alliance Church | Church | 121 | Cumberland | 40 18 20 N | 076 55 59 W |
| Alliance Church | Church | 136 | Lancaster | 40 09 10 N | 076 36 10 W |
| Alliance Church | Church | 352 | Westmoreland | 40 11 52 N | 079 35 55 W |
| Alliance College (historical) | School | 385 | Crawford | 41 47 55 N | 080 03 17 W |
| Alliance Furnace | Populated Place | 287 | Westmoreland | 40 06 50 N | 079 43 07 W |
| Allied Services Complex | Locale | 314 | Lackawanna | 41 26 50 N | 075 40 32 W |
| Allis Hollow | Populated Place | 283 | Bradford | 41 50 36 N | 076 18 21 W |
| Allison | Populated Place | 325 | Fayette | 39 59 20 N | 079 51 53 W |
| Allison Airport | Airport | 403 | Mercer | 41 10 24 N | 080 03 06 W |
| Allison Corners | Locale | 409 | Crawford | 41 31 06 N | 080 09 43 W |
| Allison Dam | Dam | 289 | Fayette | 39 59 06 N | 079 52 11 W |
| Allison Heights | Populated Place | 346 | Fayette | 39 59 10 N | 079 52 43 W |
| Allison Hollow | Valley | | Washington | 40 13 22 N | 080 12 53 W |
| Allison Park | Populated Place | 262 | Allegheny | 40 33 34 N | 079 57 31 W |
| Allison Park (subdivision) | Populated Place | 267 | Allegheny | 40 33 30 N | 079 57 29 W |
| Allison Park (subdivision) | Populated Place | 373 | Washington | 40 13 46 N | 080 14 32 W |
| Allison Park Elementary School | School | 317 | Washington | 40 13 53 N | 080 13 37 W |
| Allison Reservoir | Reservoir | 289 | Fayette | 39 59 06 N | 079 52 11 W |
| Allison School (historical) | School | 432 | Bedford | 40 05 12 N | 078 39 48 W |
| Allison School (historical) | School | 392 | Indiana | 40 48 11 N | 079 09 01 W |
| Allison School (historical) | School | 346 | Indiana | 40 45 39 N | 079 12 35 W |
| Alloway Creek | Stream | | Cambria | 39 41 57 N | 077 12 53 W |
| Allport | Populated Place | 474 | Cambria | 40 39 40 N | 078 45 28 W |
| Allport | Populated Place | 491 | Clearfield | 40 58 01 N | 078 12 05 W |
| Allwine Creek | Stream | | Somerset | 40 16 28 N | 079 00 39 W |
| Almaden | Populated Place | 495 | Clearfield | 40 45 46 N | 078 23 59 W |
| Almedia | Populated Place | 152 | Columbia | 41 00 52 N | 076 22 52 W |
| Almont | Populated Place | 174 | Bucks | 40 21 51 N | 075 20 04 W |
| Almont Post Office (historical) | Post Office | 174 | Bucks | 40 21 51 N | 075 20 04 W |
| Alnwick | Populated Place | 43 | Montgomery | 40 07 44 N | 075 04 23 W |
| Aloe Village | Locale | 73 | Bucks | 40 13 27 N | 075 07 19 W |
| Aloysius Fitzpatrick School | School | 21 | Philadelphia | 40 04 48 N | 074 58 33 W |