Monticello is a city in Jones County, Iowa, United States. As of the 2020 census, the city population was 4,040. Monticello is located at 42°14′20″N 91°11′21″W / 42.23889°N 91.18917°W. According to the United States Census Bureau, the city has a total area of 6.33 square miles, of which 6.29 square miles is land and 0.04 square miles is water. Monticello is 824 feet above sea level.
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