| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Slab | city | Pennsylvania | United States | 39.79611 | -76.33667 | 501 | 4852 |
| Slabtown | city | Pennsylvania | United States | 40.8775 | -79.39444 | 1341 | 2568 |
| Slabtown | city | Pennsylvania | United States | 39.80278 | -78.98389 | 2293 | 4598 |
| Slabtown | city | Pennsylvania | United States | 39.8275 | -77.55722 | 1007 | 13645 |
| Slabtown | city | Pennsylvania | United States | 40.905 | -76.40917 | 836 | 1957 |
| Slabtown | city | Pennsylvania | United States | 40.89278 | -76.19694 | 1112 | 3565 |
| Slackwater | city | Pennsylvania | United States | 39.98222 | -76.35639 | 278 | 49068 |
| Slaseman Mobile Home Park | city | Pennsylvania | United States | 40.19639 | -76.84278 | 508 | 38764 |
| Slate Hill | city | Pennsylvania | United States | 39.73917 | -76.28972 | 449 | 5716 |
| Slate Lick | city | Pennsylvania | United States | 40.76694 | -79.64306 | 1197 | 5294 |
| Slate Ridge | city | Pennsylvania | United States | 39.73389 | -77.09139 | 600 | 9723 |
| Slate Run | city | Pennsylvania | United States | 41.47278 | -77.50194 | 1269 | 230 |
| Slate Valley | city | Pennsylvania | United States | 40.75639 | -75.5775 | 629 | 19005 |
| Slatedale | city | Pennsylvania | United States | 40.74444 | -75.65694 | 580 | 15176 |
| Slatefield | city | Pennsylvania | United States | 40.79583 | -75.49778 | 675 | 8470 |
| Slateford | city | Pennsylvania | United States | 40.94611 | -75.11444 | 308 | 6483 |
| Slateville | city | Pennsylvania | United States | 40.66389 | -75.8675 | 498 | 3662 |
| Slatington | city | Pennsylvania | United States | 40.74833 | -75.61222 | 439 | 19857 |
| Slaymakersville | city | Pennsylvania | United States | 39.99556 | -76.04083 | 492 | 10196 |
| Slickport | city | Pennsylvania | United States | 40.67306 | -78.71 | 1699 | 5753 |
| Slickville | city | Pennsylvania | United States | 40.45972 | -79.52333 | 1256 | 7239 |
| Sligo | city | Pennsylvania | United States | 40.64333 | -79.69194 | 971 | 26362 |
| Sligo | city | Pennsylvania | United States | 41.10917 | -79.49028 | 1190 | 2718 |
| Slippery Rock | city | Pennsylvania | United States | 41.06389 | -80.05667 | 1318 | 9146 |
| Slippery Rock Park | city | Pennsylvania | United States | 41.02417 | -80.01556 | 1272 | 6938 |
| Slocum | city | Pennsylvania | United States | 41.13194 | -76.04611 | 1095 | 9239 |
| Slocum Corners | city | Pennsylvania | United States | 41.14528 | -76.02167 | 1095 | 15058 |
| Slonaker | city | Pennsylvania | United States | 40.17722 | -75.63278 | 400 | 27311 |
| Slovan | city | Pennsylvania | United States | 40.35917 | -80.39 | 1092 | 6429 |
| Slykerville | city | Pennsylvania | United States | 40.92194 | -75.98972 | 1699 | 35602 |
|
|