Walnut is located in west Iowa. Walnut is between the Pottawattamie, Cass, Shelby county. Walnut has 2.15 square miles of land area and has no water area. As of 2010-2014, the total Walnut population is 694, which has shrunk 10.80% 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%. Walnut median household income is $46,250 in 2010-2014 and has grown by 27.92% 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%. Walnut median house value is $88,700 in 2010-2014 and has grown by 32.59% since 2000. The house value growth rate is much lower than the state average rate of 53.09% and is 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 Walnut is much better than the state average in quality. The Walnut area code is 712.