Plainfield is located in southeast Pennsylvania. Plainfield is part of Cumberland County. Plainfield has 0.65 square miles of land area and has no water area. As of 2010-2014, the total Plainfield population is 238, which has shrunk 36.70% since 2000. The population growth rate is much lower than the state average rate of 3.89% and is much lower than the national average rate of 11.61%. Plainfield median household income is $27,433 in 2010-2014 and has has shrunk by 0.24% since 2000. The income growth rate is much lower than the state average rate of 32.44% and is much lower than the national average rate of 27.36%. Plainfield median house value is $159,800 in 2010-2014 and has shrunk by -79.95% since 2000. The house value growth rate is higher than the state average rate of 70.00% and is much higher than the national average rate of 46.91%. As a reference, the national Consumer Price Index (CPI) inflation rate for the same period is 26.63%. On average, the public school district that covers Plainfield is worse than the state average in quality. The Plainfield area code is 717.