Swansea is located in St. clair county Illinois with a geographic area of 6.5 square miles. The total population in Swansea is 14,100 with 47.9% male and 52.1% female. Children under age 5 represent 5.7% of the population, under age 18 equal 21.9% of the population and over age 65 is 15.8% of the population. The median household income is $81,625, per capita income is $44,275. There are a total of 5,453 housing units with 78.7% owner occupied. Education includes 16.5% of residents that are high school graduates and 48.1% with a bachelor's degree or higher. The average temperature in Swansea in the summer is 74 degrees, and in the winter 27 degrees.
