| Sligo, PA (Borough) |
| Slinger, WI (Village) |
| Slippery Rock, PA (Township) |
| Slippery Rock, PA (Borough) |
| Slippery Rock, PA (Township) |
| Sloan, IA (City) |
| Sloan, NY (Village) |
| Sloan Township, IA (Township) |
| Sloatsburg, NY (Village) |
| Slocomb, AL (City) |
| Slocum, PA (Township) |
| Slope Center, ND (Township) |
| Slope County, ND (County) |
| Smackover, AR (City) |
| Smallwood Township, IL (Township) |
