Armstrong is located close to the center of Missouri. Armstrong is between the Howard, Randolph county. Armstrong has 0.82 square miles of land area and has no water area. As of 2010-2014, the total Armstrong population is 318, which has grown 10.80% since 2000. The population growth rate is higher than the state average rate of 7.74% and is lower than the national average rate of 11.61%. Armstrong median household income is $43,750 in 2010-2014 and has grown by 81.03% since 2000. The income growth rate is much higher than the state average rate of 25.91% and is much higher than the national average rate of 27.36%. Armstrong median house value is $38,100 in 2010-2014 and has grown by 29.59% since 2000. The house value growth rate is much lower than the state average rate of 52.06% 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 Armstrong is close to the state average in quality. The Armstrong area code is 660.