Monticello, LA has a population of 5,062 and is the 6,420th largest city in the United States. The population density is 2,117 per sq mi which is 2287% higher than the Louisiana average and 2236% higher than the national average. The median age in Monticello is 38 which is approximately 6% higher than the Louisiana average of 36. In Monticello, 48% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 92% of Monticello residents were born in Louisiana, 7% were born out of state, 0% were born outside of the United States and 1% were foreign born.