South Holland, IL has a population of 22,040 and is the 1,972nd largest city in the United States. The population density is 3,045 per sq mi which is 1270% higher than the Illinois average and 3261% higher than the national average. The median age in South Holland is 41 which is approximately 10% higher than the Illinois average of 37. In South Holland, 52% of the population over 15 years of age are married, 92% speak English and 5% speak Spanish. 75% of South Holland residents were born in Illinois, 19% were born out of state, 0% were born outside of the United States and 5% were foreign born.