Garrison is located in east Iowa. Garrison is part of Benton County. Garrison has 0.25 square miles of land area and has no water area. As of 2010-2014, the total Garrison population is 349, which has shrunk 15.50% since 2000. The population growth rate is much lower than the state average rate of 5.19% and is much lower than the national average rate of 11.61%. Garrison median household income is $58,854 in 2010-2014 and has grown by 123.02% since 2000. The income growth rate is much higher than the state average rate of 33.56% and is much higher than the national average rate of 27.36%. Garrison median house value is $65,700 in 2010-2014 and has grown by 57.18% since 2000. The house value growth rate is higher than the state average rate of 53.09% and is 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 Garrison is much better than the state average in quality. The Garrison area code is 319.