Derby is located in southeast Kansas. Derby is between the Sedgwick, Butler county. Derby has 9.55 square miles of land area and 0.04 square miles of water area. As of 2010-2014, the total Derby population is 23,419, which has grown 31.52% since 2000. The population growth rate is much higher than the state average rate of 7.24% and is much higher than the national average rate of 11.61%. Derby median household income is $67,720 in 2010-2014 and has grown by 15.74% since 2000. The income growth rate is much lower than the state average rate of 27.69% and is much lower than the national average rate of 27.36%. Derby median house value is $152,800 in 2010-2014 and has grown by 45.94% since 2000. The house value growth rate is lower than the state average rate of 54.97% 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 Derby is much better than the state average in quality. The Derby area code is 316.