Monticello

County:: Piatt County
County Seat:: Yes
Area (mi²):: 3.878
State:: Illinois

Monticello is a city located in Piatt County, Illinois. Monticello has a 2025 population of 6,063. It is also the county seat of Piatt County. Monticello is currently growing at a rate of 0.38% annually and its population has increased by 1.9% since the most recent census, which recorded a population of 5,950 in 2020.

The average household income in Monticello is $99,532 with a poverty rate of 6.14%. The median age in Monticello is 42.9 years: 40.7 years for males, and 45.9 years for females.

Demographics

The racial composition of Monticello includes 94.74% White, 3.27% Black or African American, and smaller percentages for Two or more races, Asian, Native American, Native Hawaiian or Pacific Islander, other race and multiracial populations.

Population by Race

White

Black or African American

Two or more races

Asian

Native American

Native Hawaiian or Pacific Islander

Other race

Race	Population	Percentage (of total)
White	5,999	94.74%
Black or African American	207	3.27%
Two or more races	103	1.63%
Asian	23	0.36%
Native American	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%

Monticello Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Monticello's average per capita income is $53,808. Household income levels show a median of $88,611. The poverty rate stands at 6.14%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$106,276	-
Families	$97,807	$112,924
Households	$88,611	$99,532
Non Families	$56,786	$57,700

$53,808

Average Income

$88,611

Median Household Income

6.14%

Poverty Rate