| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Slab | city | Pennsylvania | United States | 39.80 | -76.34 | 830 | |
| Slabtown | city | Pennsylvania | United States | 39.83 | -77.56 | 1007 | |
| Slabtown | city | Pennsylvania | United States | 40.88 | -79.39 | 1669 | |
| Slabtown | city | Pennsylvania | United States | 40.91 | -76.41 | 830 | |
| Slabtown | city | Pennsylvania | United States | 39.80 | -78.98 | 2509 | |
| Slabtown | city | Pennsylvania | United States | 40.89 | -76.20 | 1112 | |
| Slackwater | city | Pennsylvania | United States | 39.98 | -76.36 | 278 | |
| Slaseman Mobile Home Park | city | Pennsylvania | United States | 40.20 | -76.84 | 830 | |
| Slate Hill | city | Pennsylvania | United States | 39.74 | -76.29 | 830 | |
| Slate Lick | city | Pennsylvania | United States | 40.77 | -79.64 | 1197 | |
| Slate Ridge | city | Pennsylvania | United States | 39.73 | -77.09 | 830 | |
| Slate Run | city | Pennsylvania | United States | 41.47 | -77.50 | 1669 | |
| Slate Valley | city | Pennsylvania | United States | 40.76 | -75.58 | 830 | |
| Slatedale | city | Pennsylvania | United States | 40.74 | -75.66 | 830 | |
| Slatefield | city | Pennsylvania | United States | 40.80 | -75.50 | 830 | |
| Slateford | city | Pennsylvania | United States | 40.95 | -75.11 | 308 | |
| Slateville | city | Pennsylvania | United States | 40.66 | -75.87 | 830 | |
| Slatington | city | Pennsylvania | United States | 40.75 | -75.61 | 830 | |
| Slaymakersville | city | Pennsylvania | United States | 40.00 | -76.04 | 830 | |
| Slickport | city | Pennsylvania | United States | 40.67 | -78.71 | 1699 | |
| Slickville | city | Pennsylvania | United States | 40.46 | -79.52 | 1256 | |
| Sligo | city | Pennsylvania | United States | 41.11 | -79.49 | 1190 | |
| Sligo | city | Pennsylvania | United States | 40.64 | -79.69 | 971 | |
| Slippery Rock | city | Pennsylvania | United States | 41.06 | -80.06 | 1669 | |
| Slippery Rock Park | city | Pennsylvania | United States | 41.02 | -80.02 | 1669 | |
| Slocum | city | Pennsylvania | United States | 41.13 | -76.05 | 1125 | |
| Slocum Corners | city | Pennsylvania | United States | 41.15 | -76.02 | 1095 | |
| Slonaker | city | Pennsylvania | United States | 40.18 | -75.63 | 400 | |
| Slovan | city | Pennsylvania | United States | 40.36 | -80.39 | 1092 | |
| Slykerville | city | Pennsylvania | United States | 40.92 | -75.99 | 1699 |