York township
- County:
- Day County
- County Seat:
- No
- Area (mi²):
- 34.574
- State:
- South Dakota
York township is located in Day County, South Dakota. York township has a 2025 population of 37. York township is currently declining at a rate of -2.63% annually and its population has decreased by -5.13% since the most recent census, which recorded a population of 39 in 2020.
The median age in York township is 11.3 years: 3.8 years for males, and 29.2 years for females.