Harmony township
- County:
- Spink County
- County Seat:
- No
- Area (mi²):
- 36.102
- State:
- South Dakota
Harmony township is located in Spink County, South Dakota. Harmony township has a 2026 population of 53. Harmony township is currently declining at a rate of -1.85% annually and its population has decreased by -1.85% since the most recent census, which recorded a population of 54 in 2020.
The median age in Harmony township is 64.9 years: 0 years for males, and 0 years for females. For every 100 females there are 16.7 males.