Lebanon, IL has a population of 4,369 and is the 7,041st largest city in the United States. The population density is 1,771 per sq mi which is 697% higher than the Illinois average and 1855% higher than the national average. The median age in Lebanon is 32 which is approximately 15% lower than the Illinois average of 37. In Lebanon, 56% of the population over 15 years of age are married, 97% speak English and 0% speak Spanish. 57% of Lebanon residents were born in Illinois, 38% were born out of state, 4% were born outside of the United States and 1% were foreign born.