Spring Valley township
- County:
- McCook County
- County Seat:
- No
- Area (mi²):
- 35.795
- State:
- South Dakota
Spring Valley township is located in McCook County, South Dakota. Spring Valley township has a 2026 population of 384. Spring Valley township is currently declining at a rate of 0% annually and its population has increased by 4.35% since the most recent census, which recorded a population of 368 in 2020.
The median household income in Spring Valley township is $107,813 with a poverty rate of 0.74%. The median age in Spring Valley township is 30.6 years: 26.5 years for males, and 45.2 years for females. For every 100 females there are 110.9 males.