Greens Fork is a town in Clay Township, Wayne County, in the U.S. state of Indiana.

According to the 2010 census, the town has a total area of 0.16 square miles (0.41 km2), all land.

The racial makeup of the town was 99.3% White, 0.2% Native American, 0.2% Asian, and 0.2% from two or more races.

19.0% of all households were made up of individuals, and 4.1% had someone living alone who was 65 years of age or older.

The racial makeup of the town was 97.57% White, 0.54% African American, 0.27% Asian, and 1.62% from two or more races.

The plant is rated at 40,000 gallons per day, and discharges its treated water to the Greens Fork River.