Declo is located in south Idaho. Declo is part of Cassia County. Declo has 0.28 square miles of land area and has no water area. As of 2010-2014, the total Declo population is 545, which has grown 61.24% since 2000. The population growth rate is much higher than the state average rate of 23.61% and is much higher than the national average rate of 11.61%. Declo median household income is $46,712 in 2010-2014 and has grown by 27.88% since 2000. The income growth rate is higher than the state average rate of 25.98% and is about the same as the national average rate of 27.36%. Declo median house value is $100,000 in 2010-2014 and has grown by 41.04% since 2000. The house value growth rate is lower than the state average rate of 50.99% 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 Declo is worse than the state average in quality. The Declo area code is 208.