Cut Off is located in south-central Lafourche Parish at (29.515201, -90.333839), on both sides of Bayou Lafourche. It is bordered to the northwest by
Larose and to the south by
Galliano.
Louisiana Highway 1 runs through the center of Cut Off, along the west bank of Bayou Lafourche, while
Highway 308 runs along the east bank.
Highway 3235, a four-lane highway, runs through the west side of the community. All three highways lead northwest into Larose and south into Galliano.
Thibodaux, the
parish seat, is to the northwest (upriver), and
Port Fourchon on the
Gulf of Mexico is to the south. According to the
United States Census Bureau, the Cut Off CDP has a total area of , of which are land and , or 0.85%, are water. ==Demographics==