Seneca is located in east Oregon. Seneca is part of Grant County. Seneca has 0.79 square miles of land area and has no water area. As of 2010-2014, the total Seneca population is 148, which has shrunk 33.63% since 2000. The population growth rate is much lower than the state average rate of 14.00% and is much lower than the national average rate of 11.61%. Seneca median household income is $26,964 in 2010-2014 and has has shrunk by 1.35% since 2000. The income growth rate is much lower than the state average rate of 23.47% and is much lower than the national average rate of 27.36%. Seneca median house value is $63,300 in 2010-2014 and has shrunk by -61.48% since 2000. The house value growth rate is higher than the state average rate of 53.91% 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 Seneca is much better than the state average in quality. The Seneca area code is 541.