Arnold is located close to the center of California. Arnold is part of Calaveras County. Arnold has 14.79 square miles of land area and 0.06 square miles of water area. As of 2010-2014, the total Arnold population is 2,728, which has shrunk 35.32% 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%. Arnold median household income is $58,688 in 2010-2014 and has grown by 37.17% 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%. Arnold median house value is $325,000 in 2010-2014 and has grown by 104.53% since 2000. The house value growth rate is higher than the state average rate of 75.60% 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 Arnold is better than the state average in quality. The Arnold area code is 209.