Mascoutah, IL has a population of 7,917 and is the 4,729th largest city in the United States. The population density is 830 per sq mi which is 273% higher than the Illinois average and 816% higher than the national average. The median age in Mascoutah is 34 which is approximately 10% lower than the Illinois average of 37. In Mascoutah, 58% of the population over 15 years of age are married, 96% speak English and 0% speak Spanish. 47% of Mascoutah residents were born in Illinois, 46% were born out of state, 4% were born outside of the United States and 2% were foreign born.