
Monongahela township
- County:
- Washington County
- County Seat:
- No
- Area (mi²):
- 17.434
- State:
- Pennsylvania
Monongahela township is located in Washington County, Pennsylvania. Monongahela township has a 2025 population of 1,426. Monongahela township is currently declining at a rate of -0.42% annually and its population has decreased by -3.97% since the most recent census, which recorded a population of 1,485 in 2020.
The average household income in Monongahela township is $81,468 with a poverty rate of 15.45%. The median age in Monongahela township is 41.3 years: 40.5 years for males, and 41.6 years for females.