Allen is located in east Kansas. Allen is between the Lyon, Wabaunsee county. Allen has 0.27 square miles of land area and has no water area. As of 2010-2014, the total Allen population is 333, which has grown 57.82% 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%. Allen median household income is $39,196 in 2010-2014 and has grown by 20.60% since 2000. The income growth rate is lower than the state average rate of 27.69% and is lower than the national average rate of 27.36%. Allen median house value is $39,000 in 2010-2014 and has grown by -31.22% since 2000. The house value growth rate is much lower than the state average rate of 54.97% and is much 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 Allen is much better than the state average in quality. The Allen area code is 620.