57640 Zip Code
57640 zip code is located in northwest South Dakota. 57640 zip code is part of Perkins County. 57640 zip code has 398.69 square miles of land area and 0.75 square miles of water area. As of 2010-2014, the total 57640 zip code population is 140, which has shrunk 42.39% since 2000. The population growth rate is much lower than the state average rate of 10.58% and is much lower than the national average rate of 11.61%. 57640 zip code median household income is $50,096 in 2010-2014 and has grown by 78.12% since 2000. The income growth rate is much higher than the state average rate of 42.67% and is much higher than the national average rate of 27.36%. 57640 zip code median house value is $57,400 in 2010-2014 and has grown by 87.58% since 2000. The house value growth rate is higher than the state average rate of 70.48% 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 57640 zip code is much better than the state average in quality. The 57640 zip code area code is 605.