Plymouth is located in west Illinois. Plymouth is between the Hancock, Mcdonough, Schuyler county. Plymouth has 0.56 square miles of land area and has no water area. As of 2010-2014, the total Plymouth population is 495, which has shrunk 11.92% since 2000. The population growth rate is much lower than the state average rate of 3.62% and is much lower than the national average rate of 11.61%. Plymouth median household income is $31,071 in 2010-2014 and has grown by 26.82% since 2000. The income growth rate is higher than the state average rate of 22.70% and is about the same as the national average rate of 27.36%. Plymouth median house value is $41,800 in 2010-2014 and has grown by 100.00% since 2000. The house value growth rate is much higher than the state average rate of 34.33% 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 Plymouth is close to the state average in quality. The Plymouth area code is 309.