Alton is located in Illinois. Alton, Illinois has a population of 25,902. Alton is less family-centric than the surrounding county with 23.24% of the households containing married families with children. The county average for households married with children is 30.51%.
The median household income in Alton, Illinois is $45,225. The median household income for the surrounding county is $66,882 compared to the national median of $69,021. The median age of people living in Alton is 38.1 years.
The average high temperature in July is 88.7 degrees, with an average low temperature in January of 22.7 degrees. The average rainfall is approximately 41.7 inches per year, with 15.5 inches of snow per year.
