Monticello Flag

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 2026 population of 6,041. It is also the county seat of Piatt County. Monticello is currently growing at a rate of 0.27% annually and its population has increased by 1.56% since the most recent census, which recorded a population of 5,948 in 2020.

The median household income in Monticello is $99,449 with a poverty rate of 5.73%. The median age in Monticello is 43.8 years: 41.1 years for males, and 47.3 years for females. For every 100 females there are 96.7 males.

6K
Total Population
1,558
Density (mi²)
16 0.27%
Growth

Monticello Population

Monticello Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
20266,041160.27%
20256,025150.25%
20246,010-10-0.17%
20236,020370.62%
20225,983-17-0.28%
20216,000570.96%
20205,9483876.96%
20195,56100%
20185,56110.02%
20175,560-20-0.36%
20165,580671.22%
20155,513-15-0.27%
20145,528-3-0.05%
20135,531520.95%
20125,479-58-1.05%
20115,537-23-0.41%
20105,560120.22%
20005,13858912.95%
19904,549-204-4.29%
19804,75362315.08%
19704,13091128.3%
19603,21960723.24%
19502,612893.53%
19402,52300%

Median Age

Overall: 43.8 years
Female: 47.3 years
Male: 41.1 years

Monticello Adults

There are 5,125 adults, (1,384 of whom are seniors) in Monticello.

Sex Ratio

Female: 3,205 (50.8%)
Male: 3,099 (49.2%)

Demographics

The racial composition of Monticello includes 94.51% White, and smaller percentages for Black or African American, other race, Asian, Two or more races and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White5,95894.51%
Black or African American1722.73%
Other race771.22%
Asian550.87%
Two or more races420.67%
Race
Population ↓
Percentage (of total)
Other race771.22%
Two or more races420.67%
Race
Population ↓
Percentage (of total)
White5,95894.51%
Black or African American1722.73%
Asian550.87%

Monticello Marital Status

Economics and Income Statistics

Monticello 's average per capita income is $60,713. Household income levels show a median of $99,449. The poverty rate stands at 5.73%.

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$123,143-
Families$115,815$131,095
Households$99,449$113,633
Non Families$61,944$66,850

$60,713

Average Income

$99,449

Median Household Income

5.73%

Poverty Rate

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)