Monticello is a city located in Jones County Iowa. With a 2020 population of 3,920, it is the 101st largest city in Iowa and the 5476th largest city in the United States . Monticello is currently growing at a rate of 0.51% annually and its population has increased by 3.27% since the most recent census, which recorded a population of 3,796 in 2010. Monticello reached it's highest population of in . Spanning over 6 miles, Monticello has a population density of 705 people per square mile.
The average household income in Monticello is $71,971 with a poverty rate of 8.07%. The median rental costs in recent years comes to $613 per month, and the median house value is $120,400. The median age in Monticello is 39 years, 38.1 years for males, and 40.7 years for females.