Madison township
- County:
- Lake County
- County Seat:
- No
- Area (mi²):
- 35.765
- State:
- South Dakota
Madison township is located in Lake County, South Dakota. Madison township has a 2026 population of 129. Madison township is currently declining at a rate of 0% annually and its population has increased by 1.57% since the most recent census, which recorded a population of 127 in 2020.
The median household income in Madison township is $112,917 with a poverty rate of 0%. The median age in Madison township is 34.4 years: 6.9 years for males, and 54.6 years for females. For every 100 females there are 139.1 males.