Marianna is located in southwest Pennsylvania. Marianna is part of Washington County. Marianna has 1.96 square miles of land area and has no water area. As of 2010-2014, the total Marianna population is 539, which has shrunk 13.90% 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%. Marianna median household income is $34,779 in 2010-2014 and has grown by 22.75% since 2000. The income growth rate is lower than the state average rate of 32.44% and is lower than the national average rate of 27.36%. Marianna median house value is $41,000 in 2010-2014 and has grown by 54.72% since 2000. The house value growth rate is lower than the state average rate of 70.00% 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 Marianna is close to the state average in quality. The Marianna area code is 724.