Crete, IL has a population of 8,215 and is the 4,606th largest city in the United States. The population density is 851 per sq mi which is 283% higher than the Illinois average and 840% higher than the national average. The median age in Crete is 44 which is approximately 16% higher than the Illinois average of 37. In Crete, 59% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 77% of Crete residents were born in Illinois, 19% were born out of state, 0% were born outside of the United States and 4% were foreign born.