Jefferson Township is one of fifteen townships in Greene County, Indiana, USA. As of the 2020 census, its population was 1,959, down from 2,094 at 2010.

Greene County is a county in the U.S. state of Indiana. As of 2020, the population was 30,803. The county seat is Bloomfield. The county was determined by the US Census Bureau to include the mean center of U.S. population in 1930.