| Flag Fork, Kentucky | |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | USA Kentucky#USA |
| Pushpin Label: | Flag Fork |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location within the state of Kentucky |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Kentucky |
| Subdivision Type2: | County |
| Subdivision Name2: | Franklin |
| Unit Pref: | Imperial |
| Population As Of: | 2000 |
| Population Density Km2: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 673 |
| Coordinates: | 38.3214°N -84.9483°W |
| Postal Code Type: | ZIP codes |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 508003 |
Flag Fork is an unincorporated community in Franklin County, Kentucky, United States. Its post office was open from 1875 to 1909.
The original name of the community was Baileys Mill. US Route 421 runs through the community.[1]