Lexington, IL has a population of 2,107 and is the 10,710th largest city in the United States. The population density is 1,028 per sq mi which is 363% higher than the Illinois average and 1035% higher than the national average. The median age in Lexington is 41 which is approximately 10% higher than the Illinois average of 37. In Lexington, 69% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 80% of Lexington residents were born in Illinois, 19% were born out of state, 1% were born outside of the United States and 0% were foreign born.