Duncan township
- County:
- Tioga County
- County Seat:
- No
- Area (mi²):
- 20.043
- State:
- Pennsylvania
Duncan township is located in Tioga County, Pennsylvania. Duncan township has a 2026 population of 188. Duncan township is currently growing at a rate of 1.08% annually and its population has increased by 1.08% since the most recent census, which recorded a population of 186 in 2020.
The median household income in Duncan township is $53,500 with a poverty rate of 16.3%. The median age in Duncan township is 46.4 years: 50.3 years for males, and 36.5 years for females. For every 100 females there are 132.1 males.