Fayetteville, IL has a population of 407 and is the 20,775th largest city in the United States. The population density is 1,376 per sq mi which is 519% higher than the Illinois average and 1419% higher than the national average. The median age in Fayetteville is 41 which is approximately 9% higher than the Illinois average of 37. In Fayetteville, 60% of the population over 15 years of age are married, 94% speak English and 6% speak Spanish. 77% of Fayetteville residents were born in Illinois, 17% were born out of state, 0% were born outside of the United States and 5% were foreign born.