United States › Illinois › Monmouth CITY
Monmouth Illinois · 8,599 residents (2025 est.) · 4.24 sq mi
Time machine
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The short version
Monmouth is a city of 8,581 people in Illinois. Four-year degrees are less common here than nationally, at 18% of adults. The typical home is worth $86,800, having risen by half since 2000. This skews young, with a median age of 34.1. Getting to work takes 15 minutes on average. Households here earn about 27% less than in Illinois as a whole.
At a glance
Lower income
below the US median
US median: $82,259
Younger
median age 34.1
US median: 38.9
Less educated
18% hold a bachelor's degree
US average: 36%
More affordable
home values down 7%, inflation adjusted
US median home: $376,019
Section 01
Population & growth from 9,841 in 2000
8,599 in 2025 (Census Bureau estimate)
2,023 / sq mi
−6%since 2009
from 2,147 / sq mi in 2009
US average: 281
from 33.8 in 2000
US average: 38.9
Population, 1990 – 2024
8K 9K 9K 10K 10K 1990 2000 2010 2020 2024 Monmouth Age distribution, 2024
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02
Income & economy $61,138
Unchangedinflation adjusted, since 2000
from $33,641 in 2000
US average: $82,259
from $15,839 in 2000
US average: $44,673
Households earning $100K+
from 15.5% in 2009
US average: 53.3%
from 11.1% in 2000
US average: 12.5%
from 0.423 in 2010
US average: 0.476
Workforce by industry, 2024
Professional, scientific, technical 6.7%
Public administration 3.3%
Transportation & warehousing 3.3%
Agriculture, forestry, fishing 1.8%
Arts, entertainment, food 1.4%
Education & health services 0.1%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
$86,800
−7%inflation adjusted, since 2000
from $51,000 in 2000
US average: $376,019
$733
+11%inflation adjusted, since 2000
from $364 in 2000
US average: $1,442
from 70.2% in 2000
33.7% rent
from 9.8% in 2009
US average: 10.0%
from 2.19 people in 2009
US average: 2.54
from 22.1% in 2009
US average: 22.9%
from 51.5% in 2009
US average: 47.4%
from 2.3 in 2009
Years of local income it takes to buy a local home, on a scale of about 0 to 15. Lower is more affordable.
Our index, 0 to 100. Higher means faster recent growth in incomes, home values, and college degrees.
Section 04
Race & ethnicity 2000
White, non-Hispanic 90.8%(8,940)
Hispanic / Latino 4.3%(428)
2024
White, non-Hispanic 70.4%(6,045)
Hispanic / Latino 18.1%(1,549)
from 34 in 2009
Our index, 0 to 100. Higher means a more even mix of racial and ethnic groups.
Section 04 · Origins
Detailed origins & ancestry Ancestry
+ 15 more ancestry groups with data from 17.6% in 2000
US average: 35.6%
High school or higher
from 78.1% in 2000
US average: 89.6%
from 5.7% in 2000
US average: 14.0%
Section 06
Commute & transportation from 11.4 min in 2000
US average: 26.5
from 73.1% in 2009
US average: 68.9%
from 10.3% in 2009
US average: 8.5%
from 0.4% in 2009
US average: 3.2%
from 4.3% in 2009
US average: 15.0%
from 10.3% in 2009
US average: 2.4%
from 0.9% in 2009
US average: 0.4%
from 5.8% in 2009
US average: 8.3%
Section 07
Work & employment from 10.8% in 2011
US average: 5.2%
from 60.5% in 2011
US average: 63.5%
Women 20-64 in the labor force
from 75.9% in 2020
US average: 74.6%
from 13.0% in 2009
US average: 13.1%
from 21.9% in 2009
US average: 42.5%
Section 08
People & community from 3.9% in 2009
US average: 14.1%
from 9.7% in 2009
US average: 6.2%
from 12.5% in 2012
US average: 13.3%
from 13.8% in 2013
US average: 8.4%
from 67.7% in 2017
US average: 91.0%
Computer in household
from 89.9% in 2020
US average: 95.5%
from 80.3% in 2020
US average: 87.7%
from 83.3% in 2016
US average: 77.7%
from 13.3% in 2016
US average: 13.6%
Marital status
Men 15+
Never married 47.5%(1,538)
Women 15+
Never married 43.7%(1,605)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Section 09
Health coverage from 13.8% in 2013
US average: 8.4%
from 53.5% in 2020
US average: 54.8%
Direct-purchase
from 10.8% in 2020
US average: 13.8%
from 18.4% in 2020
US average: 18.4%
from 26.0% in 2020
US average: 20.9%
VA health care
from 1.7% in 2020
US average: 2.2%
Any private
from 64.1% in 2020
US average: 67.1%
Any public
from 41.8% in 2020
US average: 36.7%
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) 13.6%(45)
Gulf War (1990s) 17.5%(58)
Share of the 331 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.
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Drill deeper
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Frequently asked
How many people live in Monmouth, Illinois? Monmouth, Illinois has about 8,581 residents according to the 2024 American Community Survey.
What is the median household income in Monmouth, Illinois? The typical household in Monmouth, Illinois earns about $61,138 a year. Half of households make more than that, and half make less.
Is Monmouth, Illinois expensive? In Monmouth, Illinois, the median home is worth about $86,800, and the typical rent is about $733 a month.
How educated are people in Monmouth, Illinois? About 18.3% of adults age 25 and over in Monmouth, Illinois hold a bachelor's degree or higher.
What is the poverty rate in Monmouth, Illinois? About 17.7% of people in Monmouth, Illinois live below the federal poverty line.
Has Monmouth, Illinois grown since 1990? Yes, Monmouth, Illinois has shrunk since 1990. The population has lost about 908 residents, a change of about -10 percent over that period.
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