North Chicago, IL has a population of 30,023 and is the 1,430th largest city in the United States. The population density is 3,756 per sq mi which is 1590% higher than the Illinois average and 4046% higher than the national average. The median age in North Chicago is 24 which is approximately 36% lower than the Illinois average of 37. In North Chicago, 33% of the population over 15 years of age are married, 67% speak English and 26% speak Spanish. 36% of North Chicago residents were born in Illinois, 45% were born out of state, 2% were born outside of the United States and 17% were foreign born.