Adelphi is located close to the center of Maryland. Adelphi is between the Prince Georges, Montgomery county. Adelphi has 2.74 square miles of land area and 0.00 square miles of water area. As of 2010-2014, the total Adelphi population is 15,885, which has grown 5.91% since 2000. The population growth rate is much lower than the state average rate of 11.16% and is much lower than the national average rate of 11.61%. Adelphi median household income is $61,870 in 2010-2014 and has grown by 35.01% since 2000. The income growth rate is lower than the state average rate of 40.25% and is higher than the national average rate of 27.36%. Adelphi median house value is $228,100 in 2010-2014 and has grown by 36.75% since 2000. The house value growth rate is much lower than the state average rate of 96.92% 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 Adelphi is worse than the state average in quality.