Johnston is located close to the center of Iowa. Johnston is part of Polk County. Johnston has 17.16 square miles of land area and 1.20 square miles of water area. As of 2010, the total Johnston population is 17,278, which has grown 99.77% since 2000. The population growth rate is much higher than the state average rate of 4.10% and is much higher than the national average rate of 9.71%. Johnston median household income is $89,453 in 2006-2010 and has grown by 17.56% since 2000. The income growth rate is lower than the state average rate of 21.52% and is lower than the national average rate of 19.17%. Johnston median house value is $236,700 in 2006-2010 and has grown by 25.70% since 2000. The house value growth rate is much lower than the state average rate of 49.58% and is much lower than the national average rate of 50.42%. 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 Johnston is much better than the state average in quality. The Johnston area code is 515.
Johnston, IA Map, Border, and Nearby Locations
* Based on the U.S. 2010 Data