Vandalia is located in Illinois. Vandalia, Illinois has a population of 6,459. Vandalia is less family-centric than the surrounding county with 23.76% of the households containing married families with children. The county average for households married with children is 27.96%.
The median household income in Vandalia, Illinois is $36,064. The median household income for the surrounding county is $47,744 compared to the national median of $69,021. The median age of people living in Vandalia is 41.7 years.
The average high temperature in July is 87 degrees, with an average low temperature in January of 20.6 degrees. The average rainfall is approximately 40.9 inches per year, with 11 inches of snow per year.
