Monticello ( MON-tih-SEL-oh) is a city in Union Township, White County, Indiana, United States. The population was 5,378 at the 2010 census. The city is the county seat of White County.
Monticello is known as a tourist destination in north-central Indiana and is home to the Indiana Beach amusement park on Lake Shafer, and Lake Freeman.
Monticello is located at 40°44′48″N 86°45′55″W (40.746709, -86.765359).
According to the 2010 census, Monticello has a total area of 3.686 square miles (9.55 km2), of which 3.47 square miles (8.99 km2) (or 94.14%) is land and 0.216 square miles (0.56 km2) (or 5.86%) is water.
At the 2010 census there were 5,378 people, 2,179 households, and 1,319 families living in the city. The population density was 1,549.9 inhabitants per square mile (598.4/km2). There were 2,457 housing units at an average density of 708.1 per square mile (273.4/km2). The racial makup of the city was 90.8% White or European American, 0.4% African American, 0.4% Native American, 0.8% Asian, 5.5% from other races, and 2.1% from two or more races. Hispanic or Latino of any race were 12.5%.
Of the 2,179 households 31.1% had children under the age of 18 living with them, 42.6% were married couples living together, 13.1% had a female householder with no husband present, 4.9% had a male householder with no wife present, and 39.5% were non-families. 34.6% of households were one person and 18.1% were one person aged 65 or older. The average household size was 2.33 and the average family size was 2.99.