Harrison township
- County:
- Mercer County
- County Seat:
- No
- Area (mi²):
- 43.547
- State:
- Missouri
Harrison township is located in Mercer County, Missouri. Harrison township has a 2026 population of 209. Harrison township is currently declining at a rate of -0.95% annually and its population has decreased by -1.42% since the most recent census, which recorded a population of 212 in 2020.
The median household income in Harrison township is $88,958 with a poverty rate of 11.02%. The median age in Harrison township is 69.3 years: 69.4 years for males, and 69.3 years for females. For every 100 females there are 122.8 males.