Columbia is located in southwest Illinois. Columbia is between the Monroe, Saint Clair county. Columbia has 10.41 square miles of land area and 0.07 square miles of water area. As of 2010-2014, the total Columbia population is 9,889, which has grown 24.83% 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%. Columbia median household income is $65,286 in 2010-2014 and has grown by 12.56% 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%. Columbia median house value is $188,200 in 2010-2014 and has grown by 47.49% 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 Columbia is much better than the state average in quality. The Columbia area code is 618.