Grinnell is located close to the center of Iowa. Grinnell is between the Poweshiek, Jasper county. Grinnell has 5.60 square miles of land area and 0.04 square miles of water area. As of 2010-2014, the total Grinnell population is 9,136, which has grown 0.34% since 2000. The population growth rate is lower than the state average rate of 5.19% and is much lower than the national average rate of 11.61%. Grinnell median household income is $45,079 in 2010-2014 and has grown by 26.54% since 2000. The income growth rate is lower than the state average rate of 33.56% and is about the same as the national average rate of 27.36%. Grinnell median house value is $138,600 in 2010-2014 and has grown by 57.14% 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 Grinnell is much better than the state average in quality. The Grinnell area code is 641.