Monongahela is located in west Pennsylvania. Monongahela is between the Washington, Allegheny county. Monongahela has 1.91 square miles of land area and 0.22 square miles of water area. As of 2010-2014, the total Monongahela population is 4,260, which has shrunk 10.52% since 2000. The population growth rate is much lower than the state average rate of 3.89% and is much lower than the national average rate of 11.61%. Monongahela median household income is $43,272 in 2010-2014 and has grown by 48.91% since 2000. The income growth rate is much higher than the state average rate of 32.44% and is much higher than the national average rate of 27.36%. Monongahela median house value is $84,800 in 2010-2014 and has grown by 46.97% since 2000. The house value growth rate is lower than the state average rate of 70.00% and is about the same as 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 Monongahela is close to the state average in quality. The Monongahela area code is 724.