Norwalk is located close to the center of Iowa. Norwalk is between the Warren, Madison county. Norwalk has 10.74 square miles of land area and 0.35 square miles of water area. As of 2010-2014, the total Norwalk population is 9,444, which has grown 37.19% since 2000. The population growth rate is much higher than the state average rate of 5.19% and is much higher than the national average rate of 11.61%. Norwalk median household income is $80,406 in 2010-2014 and has grown by 36.44% since 2000. The income growth rate is higher than the state average rate of 33.56% and is higher than the national average rate of 27.36%. Norwalk median house value is $154,300 in 2010-2014 and has grown by 49.08% since 2000. The house value growth rate is lower than the state average rate of 53.09% and is about the same as 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 Norwalk is much better than the state average in quality. The Norwalk area code is 515.