Deer Creek, IL has a population of 771 and is the 16,858th largest city in the United States. The population density is 1,365 per sq mi which is 514% higher than the Illinois average and 1407% higher than the national average. The median age in Deer Creek is 33 which is approximately 11% lower than the Illinois average of 37. In Deer Creek, 67% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 83% of Deer Creek residents were born in Illinois, 15% were born out of state, 1% were born outside of the United States and 1% were foreign born.