Decatur is located in northwest Georgia. Decatur is part of Dekalb County. Decatur has 4.27 square miles of land area and 0.00 square miles of water area. As of 2010-2014, the total Decatur population is 19,888, which has grown 9.59% since 2000. The population growth rate is much lower than the state average rate of 21.03% and is lower than the national average rate of 11.61%. Decatur median household income is $77,202 in 2010-2014 and has grown by 62.89% since 2000. The income growth rate is much higher than the state average rate of 16.28% and is much higher than the national average rate of 27.36%. Decatur median house value is $350,400 in 2010-2014 and has grown by 58.98% since 2000. The house value growth rate is much higher than the state average rate of 33.09% 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 Decatur is worse than the state average in quality. The Decatur area code is 404.