Alton is located in southwest Illinois. Alton is between the Madison, Macoupin county. Alton has 15.47 square miles of land area and 1.27 square miles of water area. As of 2010-2014, the total Alton population is 27,517, which has shrunk 9.77% 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%. Alton median household income is $36,076 in 2010-2014 and has grown by 15.58% since 2000. The income growth rate is lower than the state average rate of 22.70% and is much lower than the national average rate of 27.36%. Alton median house value is $82,300 in 2010-2014 and has grown by 45.66% 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 Alton is worse than the state average in quality. The Alton area code is 618.