Barnesville is located close to the center of Maryland. Barnesville is part of Montgomery County. Barnesville has 0.49 square miles of land area and 0.00 square miles of water area. As of 2010-2014, the total Barnesville population is 160, which has shrunk 0.62% since 2000. The population growth rate is much lower than the state average rate of 11.16% and is much lower than the national average rate of 11.61%. Barnesville median household income is $131,250 in 2010-2014 and has grown by 66.58% since 2000. The income growth rate is much higher than the state average rate of 40.25% and is much higher than the national average rate of 27.36%. Barnesville median house value is $566,200 in 2010-2014 and has grown by 122.74% since 2000. The house value growth rate is higher than the state average rate of 96.92% 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 Barnesville is better than the state average in quality. The Barnesville area code is 301.