Swansea is located in Illinois. Swansea, Illinois has a population of 13,829. Swansea is less family-centric than the surrounding county with 20% households with children. The county percentage for households with children is 28%.
The median household income in Swansea, Illinois is $72,545. The median household income for the surrounding county is $59,624 compared to the national median of $66,222. The median age of people living in Swansea is 42.5 years.
The average high temperature in July is 89.6 degrees, with an average low temperature in January of 22.1 degrees. The annual precipitation is 39.37.