Alton is located in Madison County, IL. The population is 27,619, making Alton the 2nd largest city in Madison County.
There are 7 public schools in Alton with an average Homefacts rating of C-. The total crime rate for Alton is high , and there are 6 registered sex offenders residing in the city. Unemployment in Alton is high and the median home sales price is $0. Detailed and up-to-date Alton property reports are available for any property address.
Cities near Alton include Alton Township, East Alton and West Alton.