Pontoon Beach, IL has a population of 5,753 and is the 5,916th largest city in the United States. The population density is 574 per sq mi which is 158% higher than the Illinois average and 534% higher than the national average. The median age in Pontoon Beach is 41 which is approximately 10% higher than the Illinois average of 37. In Pontoon Beach, 57% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 64% of Pontoon Beach residents were born in Illinois, 32% were born out of state, 1% were born outside of the United States and 3% were foreign born.