Gurnee, IL has a population of 31,070 and is the 1,369th largest city in the United States. The population density is 2,302 per sq mi which is 936% higher than the Illinois average and 2441% higher than the national average. The median age in Gurnee is 39 which is approximately 3% higher than the Illinois average of 37. In Gurnee, 61% of the population over 15 years of age are married, 78% speak English and 9% speak Spanish. 59% of Gurnee residents were born in Illinois, 24% were born out of state, 1% were born outside of the United States and 15% were foreign born.