Petrolia is located in north Texas. Petrolia is part of Clay County. Petrolia has 0.74 square miles of land area and 0.00 square miles of water area. As of 2010-2014, the total Petrolia population is 651, which has shrunk 16.75% since 2000. The population growth rate is much lower than the state average rate of 25.13% and is much lower than the national average rate of 11.61%. Petrolia median household income is $41,250 in 2010-2014 and has grown by 50.62% since 2000. The income growth rate is much higher than the state average rate of 31.68% and is much higher than the national average rate of 27.36%. Petrolia median house value is $61,500 in 2010-2014 and has grown by 79.82% since 2000. The house value growth rate is higher than the state average rate of 59.27% 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 Petrolia is much better than the state average in quality. The Petrolia area code is 940.