Monmouth, IL demographics:
population, income, and more

Total population
8,581
-2.4% year-over-year change
Median household income
$61,138/yr
2.4% year-over-year change
Housing units
3,750
-1.4% year-over-year change

Monmouth population

How many people live in Monmouth

Monmouth is home to 8,581 residents, according to the most recent Census data. Gender-wise, 48.3% of Monmouth locals are male, and 51.7% are female.

Total population
8,581
-2.4% year-over-year change
Gender ratio
Male
48.3%
4,143
Female
51.7%
4,438
Value Percent YoY change
Male 4,143 48.3% -3.2%
Female 4,438 51.7% -1.6%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Monmouth is 34, with the population distributed as follows: about 19.5% are children under 15, then 21.6% are in the 15 to 24 age group. Adults between 25 and 44 make up 19.7% of the population, while another 23.4% fall into the 45 to 64 bracket. Finally, around 15.9% are 65 or older.

Median age
34.1
Age breakdown
Under 15
19.5%
15 to 24
21.6%
25 to 44
19.7%
45 to 64
23.4%
Over 65
15.9%
Value Percent YoY change
Under 15 1,675 19.5% -4.5%
15 to 24 1,850 21.6% 6.7%
25 to 44 1,689 19.7% -7.6%
45 to 64 2,006 23.4% -0.9%
Over 65 1,361 15.9% -6.5%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Monmouth, 88.2% of the population are US-born citizens, while 4.2% have gained naturalized citizenship. At the same time, 7.5% of residents are non-citizens. As for race, 73.7% of locals are Caucasian, 4.5% are African American and 4.1% have Asian roots. Another 1.8% are Indigenous American, 0.8% are Pacific Islanders, while 8.9% identify as another race. There’s also a share of 6.2% that includes residents with two or more races.

Citizenship
U.S.-born citizens
88.2%
Non-U.S.-born citizens
4.2%
Non-citizens
7.5%
Value Percent YoY change
U.S.-born citizens 7,573 88.2% -2.7%
Non-U.S.-born citizens 361 4.2% -44.8%
Non-citizens 647 7.5% 80.7%
Racial breakdown
White
73.7%
Black or African American
4.5%
American Indian and Alaska Native
1.8%
Asian
4.1%
Native Hawaiian and other Pacific Islander
0.8%
Two or more races
6.2%
Other
8.9%
Value Percent
White 6,321 73.7%
Black or African American 383 4.5%
American Indian and Alaska Native 153 1.8%
Asian 355 4.1%
Native Hawaiian and other Pacific Islander 70 0.8%
Two or more races 534 6.2%
Other 765 8.9%

Households in Monmouth

A peek inside Monmouth households

Monmouth has 3,323 households, with an average of 2 members in each. Of these, 62.6% are families, while the remaining 37.4% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
3,323
0.2% year-over-year change
Average people per household
2
Non-family households
1,243
Family households
2,080
Value Percent YoY change
Non-family households 1,243 37.4% 1.6%
Family households 2,080 62.6% -0.7%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Monmouth

The housing landscape of Monmouth

Monmouth's housing consists of 3,750 units, with 78.6% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 1.6% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 3.5% of the housing landscape.

Housing units
3,750
-1.4% year-over-year change
Housing types
Value Percent
1 unit, detached 2,948 78.6%
1 unit, attached 62 1.6%
2 units 79 2.1%
3 or 4 units 92 2.4%
5 to 9 units 265 7.1%
20 to 49 units 13 0.4%
50 or more units 159 4.2%
Mobile home 132 3.5%
Homes built since 2020
33
% year-over-year change

The age of buildings in Monmouth

In Monmouth, the median construction year is 1952. About 37% of homes were built before the 1940s, with another 9.2% going up by 1949. Most development happened in the second half of the 20th century. Then, 3.8% of homes were added from 2000 to 2009, 0.3% between 2010 and 2019, and 0.9% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 1,387 37% -3.4%
Built between 1940 and 1949 347 9.2% 20.1%
Built between 1950 and 1959 578 15.4% -5.4%
Built between 1960 and 1969 538 14.4% 19.0%
Built between 1970 and 1979 455 12.1% -10.1%
Built between 1980 and 1989 147 3.9% -26.1%
Built between 1990 and 1999 110 2.9% 0.0%
Built between 2000 and 2009 144 3.8% -23.4%
Built between 2010 and 2019 11 0.3% -15.4%
Built in 2020 or later 33 0.9% N/A
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Monmouth occupancy rates

Out of the 3,323 occupied housing units in Monmouth, 66.3% are owner-occupied, while 33.7% are lived in by tenants. Meanwhile, 11.4% of all homes on the local market sit vacant.

Occupied housing units
3,323
0.2% year-over-year change
Occupancy breakdown
Renter occupied
1,121
Owner occupied
2,202
Value Percent YoY
change
Renter occupied 1,121 33.7% 18.2%
Owner occupied 2,202 66.3% -7.0%
Unoccupied housing units
11.4%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Monmouth housing costs

Housing costs in Monmouth come to a median of $767 per month, while tenants specifically pay a median gross rent of $733.

Median housing costs per month
$767/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Monmouth
$733/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Monmouth

Monmouth education at a glance

About 39% of the population in Monmouth went to high school, while 30.9% pursued college studies. Another 8.2% earned an associate degree and 9.4% hold a bachelor’s. Meanwhile, 5.6% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 453 6.9% 24.4%
High school diploma 2,552 39% -9.9%
College diploma 2,019 30.9% 1.5%
Associate degree 536 8.2% 9.4%
Bachelor's degree 612 9.4% -4.7%
Graduate degree 369 5.6% -3.9%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Monmouth

How much people earn in Monmouth

The average annual household income in Monmouth was $76,717 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +1% change from the previous year. At the same time, the median income stood at $61,138, reflecting a +2.4% shift over the same period.

Average household income in Monmouth
$76,717/year
1.0% year-over-year change
Median household income in Monmouth
$61,138/year
2.4% year-over-year change

Monmouth income by age

In Monmouth, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $62,500. Those with someone between 45 and 64 in charge, often well established professionally, earn $73,906 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $48,750, while those led by someone over 65, many of whom may be retired, have about $48,194 in earnings. Overall, 82.2% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $48,750 N/A
25 - 44 $62,500 4.8%
45 - 64 $73,906 3.1%
Over 65 $48,194 6.8%
Above poverty level
6,154
Below poverty level
1,335
Value Percent YoY
change
Above poverty level 6,154 82.2% -5.8%
Below poverty level 1,335 17.8% 2.5%

Average renter income in Monmouth

To get a better sense of what renters earn on average in Monmouth, their median household income was $47,325 according to 2022 Census data. In addition, the rent-to-income ratio in the area, at 18.6%, shows what portion of their earnings goes toward housing expenses.

Renter median household income
$47,325
Rent-to-income ratio
18.6%
Understanding the rent-to-income ratio can help renters gauge if local housing costs align with their earnings. A ratio under 30% usually signals affordability, while exceeding this mark means rent is taking a larger-than-recommended bite out of income. That could make it harder for you to cover other costs like transportation, healthcare, or child care.

Employment in Monmouth

Workforce and job types in Monmouth

The job market in Monmouth is powered by 4,134 working residents, spread across a range of industries and roles. 69.4% of the working population are employed in professional or administrative positions, while 30.6% are in hands-on or service-based jobs. Also, 3.3% run their own businesses, 66.7% are employed by private companies, and 16.3% work in the public sector.

Workforce demographics

Working population
4,134
2.3% year-over-year change
White collar
2,871
Blue collar
1,263
Value Percent YoY change
White collar 2,871 69.4% 1.3%
Blue collar 1,263 30.6% 4.5%
Employer type
Self employees
3.3%
Private companies
66.7%
Governmental workers
16.3%
Not for profit companies
13.7%
Value Percent YoY change
Self employees 135 3.3% -16.7%
Private companies 2,757 66.7% 7.9%
Governmental workers 674 16.3% 4.0%
Not for profit companies 568 13.7% -15.8%
Unemployment rate
3.6%
-51.0% year-over-year change

Available workforce

The unemployment rate in Monmouth stands at 3.6%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Monmouth

How people get around in Monmouth

In Monmouth, the average commute time is 16 minutes. Commuting methods vary: 82.8% of residents travel by personal vehicle and 6.6% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Commute time
16 min
-3.7% year-over-year change
Means of transportation
Value Percent YoY change
Car 3,376 82.8% -1.0%
Bus or trolleybus 51 1.2% 70.0%
Motorcycle 8 0.2% N/A
Bicycle 7 0.2% 40.0%
Walk 267 6.6% 0.8%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Monmouth by zipcode?

Zipcode Population Number of households Median income Average income
61462 10,458 4,239 $64,113 $83,073

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FAQs about Monmouth demographics 

What is the total population of Monmouth?

Monmouth has a total population of 8,581 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by -2.4% compared to a year ago.

What is the gender ratio in Monmouth?

The gender ratio in Monmouth is as follows:
  • 48.3% males (4,143 residents)
  • 51.7% females (4,438 residents)

What is the median age in Monmouth?

The median age in Monmouth is 34.1.

What is the age distribution of the population in Monmouth?

The age distribution in Monmouth is as follows:
  • Under 15: 19.5% (1,675 residents)
  • Ages 15-24: 21.6% (1,850 residents)
  • Ages 25-44: 19.7% (1,689 residents)
  • Ages 45-64: 23.4% (2,006 residents)
  • Over 65: 15.9% (1,361 residents)

What is the racial and ethnic makeup of Monmouth?

The racial and ethnic makeup of Monmouth is as follows:
  • White: 73.7% (6,321 residents)
  • Black or African American: 4.5% (383 residents)
  • American Indian and Alaska Native: 1.8% (153 residents)
  • Asian: 4.1% (355 residents)
  • Native Hawaiian and Other Pacific Islander: 0.8% (70 residents)
  • Two or More Races: 6.2% (534 residents)
  • Other: 8.9% (765 residents)

What percentage of the population in Monmouth are U.S.-born citizens?

U.S.-born citizens represent 88.2% of the population in Monmouth.

How many housing units are there in Monmouth?

There are 3,750 housing units in Monmouth, reflecting a -1.4% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Monmouth and what is the average household size?

Monmouth has a total of 3,323 households, with an average of 2 people in each.

What is the median household income in Monmouth?

Monmouth has a median household income of $61,138, representing a +2.4% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Monmouth?

The employment rate is 96.4% in Monmouth, with a workforce of 4,134 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 69.4% (2,871 residents)
  • Blue-collar workers: 30.6% (1,263 residents)

Places of employment:
  • Self-employed: 3.3% (135 residents)
  • Private companies: 66.7% (2,757 residents)
  • Governmental workers: 16.3% (674 residents)
  • Not-for-profit companies: 13.7% (568 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025