Alton is a city located in Madison County, in the state of Illinois (IL), United States. Nestled in the East North Central division of the Midwest region, it covers an area of 15.6 square miles (40.0 km²) and sits at an elevation of 520 ft. With a population of approximately 30,496 residents, Alton offers a vibrant community life.
The town's population is composed of about 46.92% males and 53.08% females, and it has a population density of 954.87 people per square mile (754.78/km²). Alton lies at a latitude of 38.9 and a longitude of -90.16, operating in the UTC-6.
Locals reflect a blend of American ancestry, with roots primarily in United States (8.2%), followed by English (7.8%), German (22%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 62002.