Diablo is located in west California. Diablo is part of Contra Costa County. Diablo has 1.36 square miles of land area and has no water area. As of 2010-2014, the total Diablo population is 969, which has shrunk 1.92% since 2000. The population growth rate is much lower than the state average rate of 12.39% and is much lower than the national average rate of 11.61%. Diablo median household income is $167,188 in 2010-2014 and has has shrunk by 15.52% since 2000. The income growth rate is much lower than the state average rate of 29.47% and is much lower than the national average rate of 27.36%. Diablo median house value is $1,000,001 in 2010-2014 and has shrunk by 0.00% since 2000. The house value growth rate is lower than the state average rate of 75.60% 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 Diablo is much better than the state average in quality. The Diablo area code is 925.