
Jefferson township
- County:
- Union County
- County Seat:
- No
- Area (mi²):
- 47.679
- State:
- South Dakota
Jefferson township is located in Union County, South Dakota. Jefferson township has a 2025 population of 53. Jefferson township is currently growing at a rate of 1.92% annually and its population has increased by 3.92% since the most recent census, which recorded a population of 51 in 2020.
The average household income in Jefferson township is $93,572 with a poverty rate of 4.4%. The median age in Jefferson township is 32.9 years: 32.9 years for males, and 39 years for females.