McLean, IL has a population of 779 and is the 16,786th largest city in the United States. The population density is 1,795 per sq mi which is 708% higher than the Illinois average and 1881% higher than the national average. The median age in McLean is 46 which is approximately 23% higher than the Illinois average of 37. In McLean, 70% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 89% of McLean residents were born in Illinois, 11% were born out of state, 0% were born outside of the United States and 0% were foreign born.