Barnwell is located in southwest South Carolina. Barnwell is between the Barnwell, Allendale county. Barnwell has 7.85 square miles of land area and 0.15 square miles of water area. As of 2010-2014, the total Barnwell population is 4,717, which has shrunk 6.32% since 2000. The population growth rate is much lower than the state average rate of 17.83% and is much lower than the national average rate of 11.61%. Barnwell median household income is $25,750 in 2010-2014 and has has shrunk by 3.64% since 2000. The income growth rate is much lower than the state average rate of 21.44% and is much lower than the national average rate of 27.36%. Barnwell median house value is $108,100 in 2010-2014 and has shrunk by -64.29% since 2000. The house value growth rate is higher than the state average rate of 44.99% 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 Barnwell is worse than the state average in quality. The Barnwell area code is 803.