Tagg Flats is a census-designated place (CDP) in Delaware County, Oklahoma, United States.

By road it is 16 miles (26 km) southwest of Jay, the Delaware County seat.

According to the United States Census Bureau, the Tagg Flats CDP has a total area of 5.0 square miles (13.0 km2), all land.

The racial makeup of the CDP was 54.55% White, 36.36% Native American, and 9.09% from two or more races.

The per capita income in Tagg Flats makes it the seventh-poorest place in the United States.