Monmouth city, Illinois Demographics & Population 2026
As of 2026, Monmouth city, Illinois has a total population of 8,794, the 247th largest city in Illinois, with a median household income of $59,690, which is 27% lower than the state average. The poverty rate is 16.5%.
Key Takeaways
- Housing is very affordable with a home-value-to-income ratio of just 1.5x.
Monmouth city Quick Facts
How Monmouth city Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
Moderate diversity with one or two groups making up the majority.
State average: 60 | National average: 60
Education
Educational Attainment (Adults 25+)
Monmouth city Rankings in Illinois
Explore Illinois Rankings
Cities Similar to Monmouth city
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Olney city | 8,864 | $57,997 | $96,900 | 20.1% | 15.4% |
| Steger village | 9,449 | $59,691 | $134,100 | 16.8% | 15.0% |
| Bethalto village | 9,244 | $66,469 | $158,600 | 29.8% | 11.1% |
| Rochelle city | 9,477 | $63,373 | $153,000 | 19.3% | 10.4% |
| Glenwood village | 8,620 | $71,376 | $182,900 | 36.9% | 14.0% |
Population Overview
Monmouth city is a small city located in Illinois. The total population is 8,794. It ranks as the 247th most populous out of 1,445 cities and towns in Illinois.
Age Demographics
The median age in Monmouth city is 35.0 years. This is 10% lower than the state median of 38.9 years.
Economy, Income & Housing
The median household income in Monmouth city is $59,690. This is 27% lower than the state median of $81,702. Compared to the national median of $78,538, household income here is 24% lower. The poverty rate stands at 16.5%. This is 41% higher than the state poverty rate of 11.7%. The unemployment rate is 7.2%. This is 24% higher than the state rate of 5.8%. The median home value is $88,100. Housing costs are 65% lower than the state median of $250,500. With a home-value-to-income ratio of just 1.5x, Monmouth city is one of the most affordable housing markets in the area. 71.4% of occupied housing units are owner-occupied. This homeownership rate is 7% higher than the state average of 66.8%.
Race & Ethnicity
The largest racial or ethnic group in Monmouth city is White (non-Hispanic), making up 69.7% of the population. Hispanic or Latino residents account for 18.8%. The Black or African American population (4.7%) is well below the state average of 13.6%.
Education
18.6% of residents aged 25 and older hold a bachelor's degree or higher. This is 50% lower than the state rate of 37.2%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 82.2%.
Data Sources & Methodology
All demographic data for Monmouth city, Illinois is sourced from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023). The ACS collects data from approximately 3.5 million households annually, providing reliable estimates for communities of all sizes. Comparisons are made against Illinois state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,445 Census-designated places in Illinois. For official data, visit data.census.gov.
Free data download: Get all Illinois city and county demographics as CSV. Download Cities CSV | Download Counties CSV
Frequently Asked Questions
What is the population of Monmouth city, Illinois?
Monmouth city, Illinois has a population of 8,794 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Monmouth city, IL?
The median household income in Monmouth city is $59,690, which is 24% lower the national median of $78,538.
What is the poverty rate in Monmouth city, IL?
The poverty rate in Monmouth city is 16.5%. This means approximately 1,302 residents live below the federal poverty line.
What is the racial makeup of Monmouth city, Illinois?
Monmouth city's population is 69.7% White, 4.7% Black, 18.8% Hispanic/Latino, and 4.0% Asian.
What is the median home value in Monmouth city, IL?
The median home value in Monmouth city is $88,100. The home-value-to-income ratio is 1.5x.
How educated is Monmouth city, Illinois?
18.6% of adults (25+) in Monmouth city hold a bachelor's degree or higher, and 7.1% hold a graduate or professional degree.