| Flatbrookville, New Jersey | |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | USA New Jersey Sussex County#USA New Jersey#USA |
| Pushpin Label: | Flatbrookville |
| Pushpin Map Caption: | Location within Sussex County. Inset: Location of Sussex County within New Jersey. |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Sussex |
| Subdivision Type3: | Township |
| Subdivision Name3: | Walpack |
| Named For: | Flat Brook |
| Elevation M: | 106 |
| Elevation Ft: | 348 |
| Coordinates: | 41.1003°N -74.9636°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 876381 |
Flatbrookville is an unincorporated community located along Old Mine Road within Walpack Township, in Sussex County, in the U.S. state of New Jersey.[1] It is named after the Flat Brook, a tributary of the Delaware River, which flows through the community.[2] The area is now part of the Delaware Water Gap National Recreation Area.[3]
The Decker Ferry House, built, and the Rosenkrans Ferry House, also known as the Smith-Rosenkrans House, built, provided ferry service across the Delaware River at the Walpack Bend. Both are contributing properties of the Old Mine Road Historic District.[4]