Cullom, IL has a population of 595 and is the 18,488th largest city in the United States. The population density is 1,758 per sq mi which is 691% higher than the Illinois average and 1841% higher than the national average. The median age in Cullom is 30 which is approximately 19% lower than the Illinois average of 37. In Cullom, 57% of the population over 15 years of age are married, 94% speak English and 2% speak Spanish. 84% of Cullom residents were born in Illinois, 16% were born out of state, 0% were born outside of the United States and 0% were foreign born.