
Plainfield township
- County:
- Cumberland County
- County Seat:
- No
- Area (mi²):
- 24.743
- State:
- Pennsylvania
Plainfield township is located in Cumberland County, Pennsylvania. Plainfield township has a 2025 population of 6,219. Plainfield township is currently declining at a rate of -0.02% annually and its population has decreased by -0.38% since the most recent census, which recorded a population of 6,243 in 2020.
The average household income in Plainfield township is $99,924 with a poverty rate of 9.95%. The median age in Plainfield township is 51.9 years: 53.7 years for males, and 51.6 years for females.