Lee, IL has a population of 358 and is the 21,477th largest city in the United States. The population density is 1,787 per sq mi which is 704% higher than the Illinois average and 1872% higher than the national average. The median age in Lee is 34 which is approximately 8% lower than the Illinois average of 37. In Lee, 52% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 79% of Lee residents were born in Illinois, 20% were born out of state, 1% were born outside of the United States and 1% were foreign born.