Bethalto is a village located in Madison County, Illinois, United States. Bethalto, like the rest of Madison County, is part of the Illinois Metro East portion of the Greater St. Louis metropolitan area. The population of Bethalto was 9,521 at the 2010 census.
Bethalto is located at 38°54′15″N 90°2′48″W / 38.90417°N 90.04667°W / 38.90417; -90.04667 (38.904197, -90.046579).
According to the 2010 census, Bethalto has a total area of 7.6 square miles (19.68 km), of which 7.52 square miles (19.48 km) (or 98.95%) is land and 0.08 square miles (0.21 km) (or 1.05%) is water.
As of the census of 2000, there were 9,454 people, 3,810 households, and 2,647 families residing in the village. The population density was 1,437.3 people per square mile (554.7/km²). There were 4,007 housing units at an average density of 609.2 per square mile (235.1/km²). The racial makeup of the village was 97.84% White, 0.76% African American, 0.22% Native American, 0.40% Asian, 0.33% from other races, and 0.44% from two or more races. Hispanic or Latino of any race were 1.00% of the population.
There were 3,810 households out of which 34.1% had children under the age of 18 living with them, 54.2% were married couples living together, 11.7% had a female householder with no husband present, and 30.5% were non-families. 26.8% of all households were made up of individuals and 12.5% had someone living alone who was 65 years of age or older. The average household size was 2.46 and the average family size was 2.98.
In the village, the population was spread out with 25.7% under the age of 18, 8.5% from 18 to 24, 28.7% from 25 to 44, 22.9% from 45 to 64, and 14.1% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 91.3 males. For every 100 females age 18 and over, there were 85.0 males.
The median income for a household in the village was $42,201, and the median income for a family was $50,764. Males had a median income of $41,512 versus $22,981 for females. The per capita income for the village was $18,697. About 6.5% of families and 9.2% of the population were below the poverty line, including 13.1% of those under age 18 and 6.4% of those age 65 or over.