Highland Park, IL has a population of 29,780 and is the 1,439th largest city in the United States. The population density is 2,433 per sq mi which is 994% higher than the Illinois average and 2585% higher than the national average. The median age in Highland Park is 46 which is approximately 24% higher than the Illinois average of 37. In Highland Park, 73% of the population over 15 years of age are married, 84% speak English and 6% speak Spanish. 63% of Highland Park residents were born in Illinois, 24% were born out of state, 1% were born outside of the United States and 12% were foreign born.