Roberts, IL has a population of 374 and is the 21,248th largest city in the United States. The population density is 760 per sq mi which is 242% higher than the Illinois average and 739% higher than the national average. The median age in Roberts is 37 which is approximately 1% lower than the Illinois average of 37. In Roberts, 63% of the population over 15 years of age are married, 83% speak English and 11% speak Spanish. 79% of Roberts residents were born in Illinois, 16% were born out of state, 0% were born outside of the United States and 4% were foreign born.