Fulton, IL has a population of 3,455 and is the 8,111th largest city in the United States. The population density is 1,506 per sq mi which is 578% higher than the Illinois average and 1563% higher than the national average. The median age in Fulton is 42 which is approximately 13% higher than the Illinois average of 37. In Fulton, 68% of the population over 15 years of age are married, 98% speak English and 0% speak Spanish. 37% of Fulton residents were born in Illinois, 61% were born out of state, 0% were born outside of the United States and 1% were foreign born.