| Sea Girt, NJ (Borough) |
| Sea Isle City, NJ (City) |
| Sea Ranch Lakes , FL (Village) |
| Seaboard, NC (Town) |
| Seabrook, TX (City) |
| Seabrook, NH (Town) |
| Seabrook Island, SC (Town) |
| Seadrift, TX (City) |
| Seaford, DE (City) |
| Seaforth, MN (City) |
| Seagoville, TX (City) |
| Seagraves, TX (City) |
| Seagrove, NC (Town) |
| Seal Beach, CA (City) |
| Seal Township, OH (Township) |
