Monticello, AR has a population of 9,752 and is the 4,012th largest city in the United States. The population density is 895 per sq mi which is 1513% higher than the Arkansas average and 888% higher than the national average. The median age in Monticello is 31 which is approximately 18% lower than the Arkansas average of 38. In Monticello, 50% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 77% of Monticello residents were born in Arkansas, 21% were born out of state, 0% were born outside of the United States and 1% were foreign born.