Sinclair township
- County:
- Jewell County
- County Seat:
- No
- Area (mi²):
- 34.556
- State:
- Kansas
Sinclair township is located in Jewell County, Kansas. Sinclair township has a 2025 population of 51. Sinclair township is currently declining at a rate of 0% annually and its population has decreased by -1.92% since the most recent census, which recorded a population of 52 in 2020.
The median age in Sinclair township is 25.9 years: 26.3 years for males, and 0 years for females.