Williamson is located in south Iowa. Williamson is part of Lucas County. Williamson has 0.32 square miles of land area and has no water area. As of 2010-2014, the total Williamson population is 123, which has shrunk 24.54% since 2000. The population growth rate is much lower than the state average rate of 5.19% and is much lower than the national average rate of 11.61%. Williamson median household income is $47,500 in 2010-2014 and has grown by 137.50% since 2000. The income growth rate is much higher than the state average rate of 33.56% and is much higher than the national average rate of 27.36%. Williamson median house value is $29,700 in 2010-2014 and has grown by 64.09% since 2000. The house value growth rate is higher than the state average rate of 53.09% 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 Williamson is much better than the state average in quality. The Williamson area code is 641.