Simpson is a village in Johnson County, Illinois, United States. The population was 54 at the 2000 census.Simpson is located at 37°28′5″N 88°45′23″W / 37.46806°N 88.75639°W / 37.46806; -88.75639.According to the 2010 census, Simpson has a total area of 0.531 square miles, of which 0.53 square miles is land and 0.001 square miles is water.As of the census of 2000, there were 54 people, 21 households, and 17 families residing in the village. The population density was 103.4 people per square mile. There were 25 housing units at an average density of 47.9 per square mile. The racial makeup of the village was 88.89% White, 7.41% African American, 1.85% Native American, 1.85% from other races. Hispanic or Latino of any race were 9.26% of the population.There were 21 households out of which 42.9% had children under the age of 18 living with them, 66.7% were married couples living together, 9.5% had a female householder with no husband present, and 19.0% were non-families. 19.