Union is located in east Missouri. Union is part of Franklin County. Union has 9.16 square miles of land area and has no water area. As of 2010-2014, the total Union population is 10,517, which has grown 35.58% since 2000. The population growth rate is much higher than the state average rate of 7.74% and is much higher than the national average rate of 11.61%. Union median household income is $42,315 in 2010-2014 and has grown by 6.87% since 2000. The income growth rate is much lower than the state average rate of 25.91% and is much lower than the national average rate of 27.36%. Union median house value is $138,900 in 2010-2014 and has grown by 60.02% since 2000. The house value growth rate is higher than the state average rate of 52.06% 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 Union is better than the state average in quality. The Union area code is 636.