20657 Zip Code
20657 zip code is located close to the center of Maryland. 20657 zip code is part of Calvert County. 20657 zip code has 30.08 square miles of land area and 8.68 square miles of water area. As of 2010-2014, the total 20657 zip code population is 19,639, which has grown 8.44% since 2000. The population growth rate is lower than the state average rate of 11.16% and is lower than the national average rate of 11.61%. 20657 zip code median household income is $88,162 in 2010-2014 and has grown by 55.97% since 2000. The income growth rate is higher than the state average rate of 40.25% and is much higher than the national average rate of 27.36%. 20657 zip code median house value is $252,400 in 2010-2014 and has grown by 91.21% since 2000. The house value growth rate is lower than the state average rate of 96.92% and is much 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 20657 zip code is much better than the state average in quality. The 20657 zip code area code is 410.
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