Hillcrest, IL has a population of 1,258 and is the 13,739th largest city in the United States. The population density is 393 per sq mi which is 77% higher than the Illinois average and 334% higher than the national average. The median age in Hillcrest is 33 which is approximately 13% lower than the Illinois average of 37. In Hillcrest, 55% of the population over 15 years of age are married, 83% speak English and 14% speak Spanish. 68% of Hillcrest residents were born in Illinois, 17% were born out of state, 0% were born outside of the United States and 15% were foreign born.