| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Ararat | city | Pennsylvania | United States | 41.83 | -75.52 | 2020 | |
| Arbor | city | Pennsylvania | United States | 39.88 | -76.62 | 830 | |
| Arbor Glen | city | Pennsylvania | United States | 40.17 | -75.17 | 298 | |
| Arborlea | city | Pennsylvania | United States | 39.85 | -75.51 | 396 | |
| Arbors at Providence | city | Pennsylvania | United States | 40.17 | -75.45 | 187 | |
| Arbuckle | city | Pennsylvania | United States | 41.98 | -79.86 | 1669 | |
| Arcadia | city | Pennsylvania | United States | 40.78 | -78.85 | 1669 | |
| Arcadia at Inverness Glen | city | Pennsylvania | United States | 40.13 | -75.08 | 200 | |
| Arch Rock | city | Pennsylvania | United States | 40.61 | -77.42 | 830 | |
| Arch Spring | city | Pennsylvania | United States | 40.61 | -78.20 | 1056 | |
| Archbald | city | Pennsylvania | United States | 41.49 | -75.54 | 1207 | |
| Arcola | city | Pennsylvania | United States | 40.15 | -75.46 | 200 | |
| Ardara | city | Pennsylvania | United States | 40.36 | -79.74 | 951 | |
| Arden | city | Pennsylvania | United States | 40.21 | -80.26 | 997 | |
| Arden Mines | city | Pennsylvania | United States | 40.22 | -80.26 | 1099 | |
| Ardenheim | city | Pennsylvania | United States | 40.46 | -77.98 | 830 | |
| Ardmore | city | Pennsylvania | United States | 40.01 | -75.29 | 298 | |
| Ardmore Park | city | Pennsylvania | United States | 39.99 | -75.30 | 288 | |
| Ardsley | city | Pennsylvania | United States | 40.12 | -75.16 | 288 | |
| Arendtsville | city | Pennsylvania | United States | 39.92 | -77.30 | 830 | |
| Arensburg | city | Pennsylvania | United States | 39.95 | -79.95 | 830 | |
| Argentine | city | Pennsylvania | United States | 41.09 | -79.82 | 1669 | |
| Argus | city | Pennsylvania | United States | 40.37 | -75.38 | 830 | |
| Ariosa | city | Pennsylvania | United States | 39.98 | -77.17 | 830 | |
| Aristes | city | Pennsylvania | United States | 40.82 | -76.34 | 1699 | |
| Arlingham | city | Pennsylvania | United States | 40.12 | -75.20 | 200 | |
| Arlington | city | Pennsylvania | United States | 41.41 | -75.33 | 1669 | |
| Arlington | city | Pennsylvania | United States | 40.43 | -79.97 | 885 | |
| Arlington Heights | city | Pennsylvania | United States | 40.99 | -75.22 | 830 | |
| Arlington Knolls | city | Pennsylvania | United States | 40.66 | -75.50 | 298 | |
| Arlington Park | city | Pennsylvania | United States | 39.91 | -76.69 | 830 | |
| Armagh | city | Pennsylvania | United States | 40.45 | -79.03 | 1669 | |
| Armbrust | city | Pennsylvania | United States | 40.22 | -79.55 | 997 | |
| Armstrong | city | Pennsylvania | United States | 41.09 | -80.05 | 1669 | |
| Arndts | city | Pennsylvania | United States | 40.80 | -75.48 | 830 | |
| Arnold | city | Pennsylvania | United States | 40.58 | -79.77 | 898 | |
| Arnold City | city | Pennsylvania | United States | 40.12 | -79.83 | 915 | |
| Arnot | city | Pennsylvania | United States | 41.66 | -77.12 | 1699 | |
| Arnots Addition | city | Pennsylvania | United States | 40.72 | -76.20 | 902 | |
| Arona | city | Pennsylvania | United States | 40.27 | -79.66 | 1135 | |
| Aronimink | city | Pennsylvania | United States | 39.95 | -75.32 | 200 | |
| Aronwold | city | Pennsylvania | United States | 40.01 | -75.41 | 396 | |
| Arrowhead Knoll | city | Pennsylvania | United States | 40.16 | -75.45 | 98 | |
| Arrowhead Lake | city | Pennsylvania | United States | 41.15 | -75.57 | 1696 | |
| Arroyo | city | Pennsylvania | United States | 41.39 | -78.88 | 1669 | |
| Artemas | city | Pennsylvania | United States | 39.75 | -78.44 | 1000 | |
| Arthurs | city | Pennsylvania | United States | 41.27 | -79.39 | 1669 |