Janesville is located in northeast Iowa. Janesville is between the Bremer, Black Hawk county. Janesville has 1.44 square miles of land area and 0.05 square miles of water area. As of 2010-2014, the total Janesville population is 888, which has grown 7.12% since 2000. The population growth rate is higher than the state average rate of 5.19% and is lower than the national average rate of 11.61%. Janesville median household income is $53,542 in 2010-2014 and has grown by 33.65% since 2000. The income growth rate is about the same as the state average rate of 33.56% and is higher than the national average rate of 27.36%. Janesville median house value is $153,500 in 2010-2014 and has grown by 97.81% since 2000. The house value growth rate is much higher than the state average rate of 53.09% and is much 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 Janesville is much better than the state average in quality. The Janesville area code is 319.