Duncan is located in northwest Mississippi. Duncan is part of Bolivar County. Duncan has 0.92 square miles of land area and has no water area. As of 2010-2014, the total Duncan population is 418, which has shrunk 27.68% since 2000. The population growth rate is much lower than the state average rate of 4.91% and is much lower than the national average rate of 11.61%. Duncan median household income is $28,188 in 2010-2014 and has grown by 97.31% since 2000. The income growth rate is much higher than the state average rate of 25.96% and is much higher than the national average rate of 27.36%. Duncan median house value is $51,800 in 2010-2014 and has grown by 54.17% since 2000. The house value growth rate is higher than the state average rate of 41.18% 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 Duncan is close to the state average in quality. The Duncan area codes are 601, 662.