Gilman, IL has a population of 1,753 and is the 11,802nd largest city in the United States. The population density is 779 per sq mi which is 251% higher than the Illinois average and 760% higher than the national average. The median age in Gilman is 44 which is approximately 18% higher than the Illinois average of 37. In Gilman, 63% of the population over 15 years of age are married, 84% speak English and 15% speak Spanish. 80% of Gilman residents were born in Illinois, 13% were born out of state, 0% were born outside of the United States and 7% were foreign born.