Monticello is a city of 6,304 people in Illinois. That puts it in the top 8% of US cities for household income. 83% of homes are owner-occupied. At a median age of 43.8, this is an older place than the country as a whole. The foreign-born share is 3%. Home values have more than doubled since 2000, reaching $210,500.
At a glance
Wealthier
median household income $99,449, above the US median
US median: $82,259
Older
median age 43.8
US median: 38.9
More educated
41% hold a bachelor's degree
US average: 36%
Stable housing
home values roughly flat, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about Monticello
What changed most since 1990
White share99.3% → 94.5%(−4.8 pts)US over the same years: −17.8 pts
Median home value (2024 dollars)$153,124 → $210,500(+37%)US over the same years: +67%
Monticello's population equals 38% of Piatt County's. Its number of foreign-born residents equals 61% of the county's. Its number of adults with a bachelor's degree or higher equals 49% of the county's.
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans
Veterans by period of service, 2024
Gulf War (2001 or later)10.6%(30)
US avg: 26.4%
Gulf War (1990s)28.4%(80)
US avg: 24.3%
Vietnam era40.4%(114)
US avg: 33.1%
Korean War9.6%(27)
US avg: 4.5%
World War II0%(0)
US avg: 1%
Share of the 282 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
Monticello, decade by decade
Monticello population, inflation-adjusted income and home value, education, and diversity by year
Year
Population
Median household income
Median home value
Bachelor's degree+
Diversity score
1990
4,549
$80,381
$153,124
23.9%
1.7
2000
5,138
$83,348
$176,336
30.7%
4.0
2010
5,548
$82,201
$218,231
29.8%
7.5
2020
5,941
$92,923
$202,774
40.3%
16.0
2024
6,304
$99,449
$210,500
40.7%
13.2
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.
