Jefferson township
- County:
- Union County
- County Seat:
- No
- Area (mi²):
- 35.849
- State:
- South Dakota
Jefferson township is located in Union County, South Dakota. Jefferson township has a 2026 population of 175. Jefferson township is currently growing at a rate of 2.34% annually and its population has increased by 4.17% since the most recent census, which recorded a population of 168 in 2020.
The median household income in Jefferson township is $101,250 with a poverty rate of 0%. The median age in Jefferson township is 51.1 years: 37.4 years for males, and 54.4 years for females. For every 100 females there are 94.7 males.