Frederick township
- County:
- Brown County
- County Seat:
- No
- Area (mi²):
- 34.807
- State:
- South Dakota
Frederick township is located in Brown County, South Dakota. Frederick township has a 2026 population of 48. Frederick township is currently declining at a rate of -2.04% annually and its population has decreased by -2.04% since the most recent census, which recorded a population of 49 in 2020.
The median household income in Frederick township is $118,333 with a poverty rate of 0%. The median age in Frederick township is 52.5 years: 52.2 years for males, and 60.3 years for females. For every 100 females there are 178.6 males.