McCullom Lake, IL has a population of 1,011 and is the 15,077th largest city in the United States. The population density is 2,685 per sq mi which is 1108% higher than the Illinois average and 2863% higher than the national average. The median age in McCullom Lake is 34 which is approximately 9% lower than the Illinois average of 37. In McCullom Lake, 53% of the population over 15 years of age are married, 87% speak English and 11% speak Spanish. 79% of McCullom Lake residents were born in Illinois, 10% were born out of state, 0% were born outside of the United States and 10% were foreign born.