Leland, IL has a population of 844 and is the 16,232nd largest city in the United States. The population density is 1,581 per sq mi which is 611% higher than the Illinois average and 1645% higher than the national average. The median age in Leland is 39 which is approximately 5% higher than the Illinois average of 37. In Leland, 64% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 84% of Leland residents were born in Illinois, 14% were born out of state, 1% were born outside of the United States and 1% were foreign born.