Lindenhurst, IL has a population of 14,380 and is the 2,927th largest city in the United States. The population density is 3,187 per sq mi which is 1334% higher than the Illinois average and 3417% higher than the national average. The median age in Lindenhurst is 39 which is approximately 3% higher than the Illinois average of 37. In Lindenhurst, 64% of the population over 15 years of age are married, 88% speak English and 4% speak Spanish. 69% of Lindenhurst residents were born in Illinois, 22% were born out of state, 1% were born outside of the United States and 8% were foreign born.