Williamsfield is located in northwest Illinois. Williamsfield is between the Knox, Peoria county. Williamsfield has 1.27 square miles of land area and has no water area. As of 2010-2014, the total Williamsfield population is 574, which has shrunk 7.42% since 2000. The population growth rate is much lower than the state average rate of 3.62% and is much lower than the national average rate of 11.61%. Williamsfield median household income is $49,271 in 2010-2014 and has grown by 26.81% since 2000. The income growth rate is higher than the state average rate of 22.70% and is about the same as the national average rate of 27.36%. Williamsfield median house value is $76,300 in 2010-2014 and has grown by 35.28% since 2000. The house value growth rate is about the same as the state average rate of 34.33% and is lower 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 Williamsfield is close to the state average in quality. The Williamsfield area code is 309.