Monticello, IL Profile: Facts & Data

Monticello, Illinois - Basic Facts

The City of Monticello had a population of 6,010 as of July 1, 2025.

The primary coordinate point for Monticello is located at latitude 40.0278 and longitude -88.5734 in Piatt County. The formal boundaries for the City of Monticello encompass a land area of 3.8 sq. miles and a water area of 0.04 sq. miles. Piatt County is in the Central time zone (GMT -6).

The City of Monticello has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Monticello is located within Township of Monticello, a minor civil division (MCD) of Piatt County.

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Monticello, IL Data & Demographics (As of July 1, 2025)

POPULATION
Total Population	6,010 (100%)
Population in Households	5,842 (97.2%)
Population in Families	4,750 (79.0%)
Population in Group Quarters¹	168 ( 2.8%)
Population Density	1,490
Diversity Index²	15


INCOME
Median Household Income	$82,066
Average Household Income	$94,919
% of Income for Mortgage⁴	16%
Per Capita Income	$39,310
Wealth Index⁵	75
Socioeconomic Status Index⁶	Moderate (59.2)

HOUSING
Total HU (Housing Units)	2,676 (100%)
Owner Occupied HU	1,988 (74.3%)
Renter Occupied HU	496 (18.5%)
Vacant Housing Units	192 ( 7.2%)
Median Home Value	$205,065
Average Home Value	$234,416
Housing Affordability Index³	132

HOUSEHOLDS
Total Households	2,484
Average Household Size	2.35
Family Households	1,647
Average Family Size	3.00

HOUSING

Total HU (Housing Units)

2,676 (100%)

Owner Occupied HU

1,988 (74.3%)

Renter Occupied HU

496 (18.5%)

Vacant Housing Units

192 ( 7.2%)

Median Home Value

$205,065

Average Home Value

$234,416

Housing Affordability Index³

132

HOUSEHOLDS

Total Households

2,484

Average Household Size

2.35

Family Households

1,647

Average Family Size

3.00

NOTES

Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.

GROWTH RATE / YEAR	2020-2025	2025-2030
Population	0.22%	0.06%
Households	0.55%	0.38%
Families		0.41%
Median Household Income		1.48%
Per Capita Income		1.70%
Owner Occupied HU		0.57%

GROWTH RATE / YEAR

2020-2025

2025-2030

Population

0.22%

0.06%

Households

0.55%

0.38%

Families

0.41%

Median Household Income

1.48%

Per Capita Income

1.70%

Owner Occupied HU

0.57%

Monticello, IL - Peer Comparisons by Rank and Percentile

The table below compares Monticello to the other 1,461 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2025 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description	Rank	Percentile
Total Population	# 302	79th
Population Density	# 413	72nd
Median Household Income	# 557	62nd
Housing Affordability Index	# 800	55th
Per Capita Income	# 729	50th
Diversity Index	# 1082	26th

Variable Description

Rank

Percentile

Total Population

# 302

79th

Population Density

# 413

72nd

Median Household Income

# 557

62nd

Housing Affordability Index

# 800

55th

Per Capita Income

# 729

50th

Diversity Index

# 1082

26th

Illinois Census Data Comparison Tool

Monticello, IL Profile: Facts & Data

Monticello, Illinois - Basic Facts

Monticello, IL Data & Demographics (As of July 1, 2025)

POPULATION

INCOME

HOUSING

HOUSEHOLDS

GROWTH RATE / YEAR

Monticello, IL - Peer Comparisons by Rank and Percentile

Monticello, IL - Most Popular Things to Do

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Piatt County