Pontoon Beach is a village in Madison County, Illinois, United States. The population was 5,836 at the 2010 census.
Pontoon Beach is located at 38°43′34″N 90°3′38″W (38.726078, -90.060505).
According to the 2010 census, Pontoon Beach has a total area of 12.564 square miles (32.54 km2), of which 10.02 square miles (25.95 km2) (or 79.75%) is land and 2.544 square miles (6.59 km2) (or 20.25%) is water.
As of the census of 2000, there were 5,620 people, 2,134 households, and 1,519 families residing in the village. The population density was 686.9 people per square mile (265.3/km2). There were 2,341 housing units at an average density of 286.1 per square mile (110.5/km2). The racial makeup of the village was 87.72% White, 8.88% African American, 0.55% Native American, 0.78% Asian, 0.02% Pacific Islander, 0.71% from other races, and 1.33% from two or more races. Hispanic or Latino of any race were 1.92% of the population.
There were 2,134 households, out of which 38.0% had children under the age of 18 living with them, 48.9% were married couples living together, 16.0% had a female householder with no husband present, and 28.8% were non-families. 22.0% of all households were made up of individuals, and 6.9% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 3.06.
In the village, the population was spread out, with 28.2% under the age of 18, 11.0% from 18 to 24, 30.6% from 25 to 44, 21.8% from 45 to 64, and 8.4% who were 65 years of age or older.