| Sunbury Township, IL (Township) |
| Suncoast Community Development District, FL (CDD) |
| Sundal, MN (Township) |
| Sundance, WY (Town) |
| Sunderland, MA (Town) |
| Sunderland, VT (Town) |
| Sundown, TX (City) |
| Sundown, MN (Township) |
| Sundre, ND (Township) |
| Sunfield, MI (Village) |
| Sunfield Township, MI (Township) |
| Sunfish Lake, MN (City) |
| Sunfish Township, OH (Township) |
| Sunflower, MS (Town) |
| Sunflower County, MS (County) |
