Martinez is located in west California. Martinez is part of Contra Costa County. Martinez has 12.13 square miles of land area and 1.00 square miles of water area. As of 2010-2014, the total Martinez population is 36,876, which has grown 2.82% 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%. Martinez median household income is $85,736 in 2010-2014 and has grown by 36.07% since 2000. The income growth rate is higher than the state average rate of 29.47% and is higher than the national average rate of 27.36%. Martinez median house value is $407,600 in 2010-2014 and has grown by 60.28% since 2000. The house value growth rate is lower than the state average rate of 75.60% and is 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 Martinez is better than the state average in quality. The Martinez area code is 925.