Allen is located close to the center of Oklahoma. Allen is between the Pontotoc, Coal, Hughes county. Allen has 0.89 square miles of land area and has no water area. As of 2010-2014, the total Allen population is 990, which has grown 4.10% since 2000. The population growth rate is much lower than the state average rate of 10.67% and is much lower than the national average rate of 11.61%. Allen median household income is $40,556 in 2010-2014 and has grown by 79.20% since 2000. The income growth rate is much higher than the state average rate of 38.43% and is much higher than the national average rate of 27.36%. Allen median house value is $68,800 in 2010-2014 and has grown by 87.98% since 2000. The house value growth rate is higher than the state average rate of 62.66% 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 Allen is close to the state average in quality. The Allen area code is 580.