Sublette, IL has a population of 436 and is the 20,388th largest city in the United States. The population density is 1,256 per sq mi which is 465% higher than the Illinois average and 1287% higher than the national average. The median age in Sublette is 47 which is approximately 25% higher than the Illinois average of 37. In Sublette, 60% of the population over 15 years of age are married, 93% speak English and 5% speak Spanish. 86% of Sublette residents were born in Illinois, 10% were born out of state, 0% were born outside of the United States and 4% were foreign born.