Swansea is located in Illinois.
Swansea, Illinois has population of 13,543.
Swansea is more family-centric than the surrounding county with 32.59% of the households containing married families with children.
The median household income in Swansea, Illinois is $66,491.
The median household income for the surrounding county is $50,728 compared to the national median of $53,482.
The median age of people living in Swansea is 40.6 years.
The average high temperature in July is 88.9 degrees, with an average low temperature in January of 22.4 degrees.
The average rainfall is approximately 42.6 inches per year, with 13.2 inches of snow per year.