Andover township
- County:
- Day County
- County Seat:
- No
- Area (mi²):
- 71.162
- State:
- South Dakota
Andover township is located in Day County, South Dakota. Andover township has a 2026 population of 115. Andover township is currently growing at a rate of 0.88% annually and its population has increased by 3.6% since the most recent census, which recorded a population of 111 in 2020.
The median household income in Andover township is $110,750 with a poverty rate of 5%. The median age in Andover township is 40.5 years: 40.8 years for males, and 30.7 years for females. For every 100 females there are 62.8 males.