Northumberland is located close to the center of Pennsylvania. Northumberland is part of Northumberland County. Northumberland has 1.51 square miles of land area and 0.00 square miles of water area. As of 2010-2014, the total Northumberland population is 3,772, which has grown 1.56% since 2000. The population growth rate is lower than the state average rate of 3.89% and is much lower than the national average rate of 11.61%. Northumberland median household income is $47,311 in 2010-2014 and has grown by 48.35% since 2000. The income growth rate is higher than the state average rate of 32.44% and is much higher than the national average rate of 27.36%. Northumberland median house value is $130,800 in 2010-2014 and has grown by 61.68% 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 Northumberland is worse than the state average in quality. The Northumberland area code is 570.