Green Grass (Lakota: wakpála phežŋ; "creek [of the] grass") is a census-designated place (CDP) in Dewey County, South Dakota, United States. The population was 21 at the 2020 census.
The community takes its name from nearby Green Grass Creek.
Geography
According to the United States Census Bureau, the CDP has a total area of , all land.
Demographics
As of the census which jointly operates Cheyenne-Eagle Butte School with the Bureau of Indian Education (BIE).