Plainfield is located in northeast Illinois. Plainfield is between the Will, Kendall county. Plainfield has 23.22 square miles of land area and 0.98 square miles of water area. As of 2010-2014, the total Plainfield population is 40,641, which has grown 211.71% since 2000. The population growth rate is much higher than the state average rate of 3.62% and is much higher than the national average rate of 11.61%. Plainfield median household income is $111,536 in 2010-2014 and has grown by 38.04% since 2000. The income growth rate is much higher than the state average rate of 22.70% and is higher than the national average rate of 27.36%. Plainfield median house value is $289,300 in 2010-2014 and has grown by 45.89% since 2000. The house value growth rate is higher than the state average rate of 34.33% and is about the same as 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 better than the state average in quality. The Plainfield area code is 815.