| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Ararat | city | Pennsylvania | United States | 41.82944 | -75.525 | 2020 | 1282 |
| Arbor | city | Pennsylvania | United States | 39.88028 | -76.62278 | 731 | 29018 |
| Arbuckle | city | Pennsylvania | United States | 41.98278 | -79.86417 | 1295 | 2458 |
| Arcadia | city | Pennsylvania | United States | 40.78111 | -78.85278 | 1666 | 2391 |
| Arch Rock | city | Pennsylvania | United States | 40.6075 | -77.41861 | 554 | 3249 |
| Arch Spring | city | Pennsylvania | United States | 40.60583 | -78.20306 | 1056 | 2013 |
| Archbald | city | Pennsylvania | United States | 41.49472 | -75.53722 | 1207 | 16486 |
| Arcola | city | Pennsylvania | United States | 40.1525 | -75.45694 | 200 | 45596 |
| Ardara | city | Pennsylvania | United States | 40.35778 | -79.73528 | 951 | 48191 |
| Arden | city | Pennsylvania | United States | 40.205 | -80.25917 | 997 | 36435 |
| Arden Mines | city | Pennsylvania | United States | 40.21861 | -80.26472 | 1099 | 29234 |
| Ardenheim | city | Pennsylvania | United States | 40.46417 | -77.98333 | 600 | 8020 |
| Ardmore | city | Pennsylvania | United States | 40.00667 | -75.28583 | 298 | 220682 |
| Ardmore Park | city | Pennsylvania | United States | 39.99389 | -75.29778 | 288 | 234526 |
| Ardsley | city | Pennsylvania | United States | 40.12111 | -75.15556 | 288 | 249958 |
| Arendtsville | city | Pennsylvania | United States | 39.92306 | -77.29889 | 702 | 4034 |
| Arensburg | city | Pennsylvania | United States | 39.95278 | -79.95 | 800 | 8620 |
| Argentine | city | Pennsylvania | United States | 41.09417 | -79.81944 | 1315 | 2283 |
| Argus | city | Pennsylvania | United States | 40.36639 | -75.38333 | 495 | 16129 |
| Ariosa | city | Pennsylvania | United States | 39.97722 | -77.175 | 728 | 4852 |
| Aristes | city | Pennsylvania | United States | 40.81833 | -76.33861 | 1699 | 13191 |
| Arlingham | city | Pennsylvania | United States | 40.11528 | -75.20361 | 200 | 205765 |
| Arlington | city | Pennsylvania | United States | 41.41194 | -75.32611 | 1499 | 3427 |
| Arlington Heights | city | Pennsylvania | United States | 40.99 | -75.21667 | 498 | 27568 |
| Arlington Knolls | city | Pennsylvania | United States | 40.65667 | -75.49722 | 298 | 136774 |
| Arlington Park | city | Pennsylvania | United States | 39.905 | -76.68583 | 800 | 44294 |
| Arlington subdivision | city | Pennsylvania | United States | 40.42583 | -79.97472 | 885 | 274893 |
| Armagh | city | Pennsylvania | United States | 40.45361 | -79.03222 | 1519 | 3857 |
| Armbrust | city | Pennsylvania | United States | 40.22361 | -79.55139 | 997 | 27524 |
| Armstrong | city | Pennsylvania | United States | 41.09417 | -80.05194 | 1299 | 14243 |
| Arndts | city | Pennsylvania | United States | 40.79944 | -75.47722 | 708 | 8470 |
| Arnold | city | Pennsylvania | United States | 40.58 | -79.76694 | 898 | 58178 |
| Arnold City | city | Pennsylvania | United States | 40.11639 | -79.82528 | 915 | 18218 |
| Arnot | city | Pennsylvania | United States | 41.6625 | -77.12333 | 1817 | 1531 |
| Arnots Addition | city | Pennsylvania | United States | 40.71806 | -76.20028 | 902 | 28918 |
| Arona | city | Pennsylvania | United States | 40.26917 | -79.66167 | 1135 | 32011 |
| Aronimink | city | Pennsylvania | United States | 39.95056 | -75.31889 | 200 | 287838 |
| Aronwold | city | Pennsylvania | United States | 40.01472 | -75.41444 | 396 | 75195 |
| Arrowhead Lake | city | Pennsylvania | United States | 41.15083 | -75.57417 | 1696 | 3713 |
| Arroyo | city | Pennsylvania | United States | 41.39083 | -78.88056 | 1368 | 189 |
| Artemas | city | Pennsylvania | United States | 39.74694 | -78.43917 | 1000 | 875 |
| Arthurs | city | Pennsylvania | United States | 41.27083 | -79.39083 | 1499 | 6518 |
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