Darby is located in southeast Pennsylvania. Darby is part of Delaware County. Darby has 0.84 square miles of land area and has no water area. As of 2010-2014, the total Darby population is 10,689, which has grown 3.79% since 2000. The population growth rate is about the same as the state average rate of 3.89% and is much lower than the national average rate of 11.61%. Darby median household income is $32,224 in 2010-2014 and has grown by 4.16% since 2000. The income growth rate is much lower than the state average rate of 32.44% and is much lower than the national average rate of 27.36%. Darby median house value is $80,200 in 2010-2014 and has grown by 56.34% since 2000. The house value growth rate is lower than the state average rate of 70.00% 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 Darby is worse than the state average in quality. The Darby area code is 610.