Belknap is located in south Illinois. Belknap is between the Johnson, Massac county. Belknap has 1.06 square miles of land area and 0.00 square miles of water area. As of 2010-2014, the total Belknap population is 75, which has shrunk 43.61% 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%. Belknap median household income is $21,875 in 2010-2014 and has has shrunk by 14.63% since 2000. The income growth rate is much lower than the state average rate of 22.70% and is much lower than the national average rate of 27.36%. Belknap median house value is $42,500 in 2010-2014 and has shrunk by -88.89% since 2000. The house value growth rate is much higher than the state average rate of 34.33% 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 Belknap is better than the state average in quality. The Belknap area code is 618.