| Flat Branch Township, IL (Township) |
| Flat Butte, SD (Township) |
| Flat Creek, SD (Township) |
| Flat Rock, MI (City) |
| Flat Rock, NC (Village) |
| Flat Rock, IL (Village) |
| Flat Rock, IN (Township) |
| Flathead County, MT (County) |
| Flatonia, TX (Town) |
| Flatrock Township, OH (Township) |
| Flatwoods, KY (City) |
| Flatwoods, WV (Town) |
| Flaxton, ND (City) |
| Flaxville, MT (Town) |
| Fleetwood, PA (Borough) |
