Cairo is located in south Illinois. Cairo is part of Alexander County. Cairo has 6.97 square miles of land area and 2.12 square miles of water area. As of 2010-2014, the total Cairo population is 2,688, which has shrunk 25.99% 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%. Cairo median household income is $16,727 in 2010-2014 and has has shrunk by 22.59% 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%. Cairo median house value is $35,000 in 2010-2014 and has shrunk by -40.56% since 2000. The house value growth rate is higher than 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 Cairo is worse than the state average in quality. The Cairo area code is 618.