Agency township is located in Roberts County, South Dakota. Agency township has a 2026 population of 321. Agency township is currently growing at a rate of 1.58% annually and its population has increased by 6.64% since the most recent census, which recorded a population of 301 in 2020.
The median age in Agency township is 27 years: 22.4 years for males, and 53 years for females. For every 100 females there are 120.7 males.
Data after 2023 is projected based on recent change
Overall: 27 years
Female: 53 years
Male: 22.4 years
There are 93 adults, (15 of whom are seniors) in Agency township.
Female: 58 (45.3%)
Male: 70 (54.7%)
The racial composition of Agency township includes 68.75% Native American, 9.38% White, and smaller percentages for and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| Native American | 88 | 68.75% |
| Two or more races | 28 | 21.88% |
| White | 12 | 9.38% |