Alton is a city located in Madison County Illinois. With a 2020 population of 25,690, it is the 88th largest city in Illinois and the 1507th largest city in the United States . Alton is currently declining at a rate of -1.00% annually and its population has decreased by -7.81% since the most recent census, which recorded a population of 27,865 in 2010. Alton reached it's highest population of 43,047 in 1960. Spanning over 17 miles, Alton has a population density of 1,658 people per square mile.
The average household income in Alton is $53,625 with a poverty rate of 26.60%. The median rental costs in recent years comes to $773 per month, and the median house value is $79,900. The median age in Alton is 38.8 years, 35.5 years for males, and 41.5 years for females.