Foster township is located in Perkins County, South Dakota. Foster township has a 2026 population of 21. Foster township is currently declining at a rate of 0% annually and its population has decreased by 0% since the most recent census, which recorded a population of 21 in 2020.
Data after 2023 is projected based on recent change
Overall: 0 years
Female: 0 years
Male: 0 years
There are 80 adults, (0 of whom are seniors) in Foster township.
Female: 57 (71.3%)
Male: 23 (28.7%)
The racial composition of Foster township includes 28.75% White, and smaller percentages for and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| Two or more races | 57 | 71.25% |
| White | 23 | 28.75% |