Vermillion township is located in Clay County, South Dakota. Vermillion township has a 2026 population of 388. Vermillion township is currently declining at a rate of -1.02% annually but its population has increased by 1.31% since the most recent census, which recorded a population of 383 in 2020.
The median age in Vermillion township is 52.2 years: 52.5 years for males, and 45.3 years for females. For every 100 females there are 82.0 males.
Data after 2023 is projected based on recent change
Overall: 52.2 years
Female: 45.3 years
Male: 52.5 years
There are 202 adults, (34 of whom are seniors) in Vermillion township.
Female: 133 (55%)
Male: 109 (45%)
The racial composition of Vermillion township includes 93.8% White, and smaller percentages for and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 227 | 93.8% |
| Two or more races | 15 | 6.2% |