Andover is located in northwest Illinois. Andover is part of Henry County. Andover has 0.99 square miles of land area and has no water area. As of 2010-2014, the total Andover population is 582, which has shrunk 2.02% 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%. Andover median household income is $61,042 in 2010-2014 and has grown by 30.03% since 2000. The income growth rate is higher than the state average rate of 22.70% and is higher than the national average rate of 27.36%. Andover median house value is $125,600 in 2010-2014 and has grown by 62.06% since 2000. The house value growth rate is much higher than the state average rate of 34.33% and is 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 Andover is better than the state average in quality. The Andover area code is 309.