Monmouth is a city located in Warren County Illinois. Monmouth has a 2024 population of 8,457. It is also the county seat of Warren County. Monmouth is currently declining at a rate of -1.28% annually and its population has decreased by -4.93% since the most recent census, which recorded a population of 8,896 in 2020.
The average household income in Monmouth is $75,937 with a poverty rate of 16.54%. The median age in Monmouth is 35 years: 33.8 years for males, and 37.8 years for females.
According to the most recent ACS, the racial composition of Monmouth was:
Race | Population | Percentage (of total) |
|---|---|---|
| White | 6,636 | 75.46% |
| Other race | 711 | 8.09% |
| Two or more races | 417 | 4.74% |
| Black or African American | 412 | 4.69% |
| Asian | 356 | 4.05% |
| Native American | 197 | 2.24% |
| Native Hawaiian or Pacific Islander | 65 | 0.74% |
White
Other race
Two or more races
Black or African American
Asian
Native American
Native Hawaiian or Pacific Islander
Household Type | Count | Average Size | Owner | Renter |
|---|---|---|---|---|
| All | 3,317 | 2.37 | 71.4 | 28.6 |
| Married | 1,240 | 3.08 | 90.4 | 9.6 |
| Non Family | 1,223 | 1.12 | 55.4 | 44.6 |
| Female | 661 | 3.14 | 65.8 | 34.2 |
| Male | 193 | 3.06 | 70.5 | 29.5 |
2.98
Average Family Size
2.37
Average Household Size
71.4%
Rate of Home Ownership
Married
Male
Female
NonFamily
owner
renter
Male
Female
Education Attained | Count | Percentage |
|---|---|---|
| 9th to 12th Grade | 583 | 10.99% |
| Associates Degree | 437 | 8.23% |
| Bachelors Degree | 611 | 11.51% |
| Graduate Degree | 379 | 7.14% |
| High School Graduate | 1,859 | 35.03% |
| Less Than 9th Grade | 364 | 6.86% |
| Some College | 1,074 | 20.24% |
Less Than 9th Grade
9th to 12th Grade
High School Graduate
Some College
Associates Degree
Bachelors Degree
Graduate Degree
High School Graduation Rate
Bachelors Rate
Race | Total | High School | Bachelors |
|---|---|---|---|
| White | 4,053 | 3,641 | 832 |
| Hispanic | 773 | 431 | 114 |
| Other Race | 365 | 130 | 31 |
| Black | 223 | 202 | 39 |
| Asian | 165 | 0 | 0 |
| 2+ Races | 146 | 126 | 40 |
| Native American | 67 | 61 | 0 |
| Islander | 15 | 15 | 0 |
The highest rate of high school graduation is among islander people with a rate of 100%.
The highest rate of bachelors degrees is among 2+ races people with a rate of 27.4%.
All
Male
Female
Name | Average | Male | Female |
|---|---|---|---|
| Bachelors Degree | $43,092 | $55,972 | $38,250 |
| Graduate Degree | $60,694 | $77,875 | $51,154 |
| High School Graduate | $37,891 | $44,954 | $28,534 |
| Less Than 9th Grade | $49,539 | $57,833 | $33,438 |
| Overall | $39,820 | $52,101 | $32,868 |
| Some College | $32,109 | $45,599 | $26,500 |
$39,820
Average Earnings
$52,101
Average Male
$32,868
Average Female
Only English
Spanish
Other Indo-European Languages
Asian and Pacific Island Languages
Other Languages
82.82% of Monmouth residents speak only English, while 17.18% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 11.7% of the population.
rate
Name | Total | In Poverty | Poverty Rate |
|---|---|---|---|
| White | 5,489 | 717 | 13.06% |
| Hispanic | 1,561 | 561 | 35.94% |
| Other | 691 | 292 | 42.26% |
| Native | 197 | 157 | 79.7% |
| Multiple | 358 | 42 | 11.73% |
| Black | 326 | 12 | 3.68% |
16.54%
Overall Poverty Rate
15.35%
Male Poverty Rate
17.67%
Female Poverty Rate
The race most likely to be in poverty in Monmouth is Native, with 79.7% below the poverty level.
The race least likely to be in poverty in Monmouth is Black, with 3.68% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 1.33%. Among those working part-time, it was 13.35%, and for those that did not work, the poverty rate was 26.15%.
rate
Rate | Poverty |
|---|---|
| Less Than 9th Grade | 17.93% |
| Some College | 11.93% |
| High School | 11.51% |
| Bachelors or Greater | 4.6% |
rate
Rate | Poverty |
|---|---|
| Female Unemployed | 12.38% |
| Female Employed | 8.31% |
| Male Unemployed | 4.66% |
| Male Employed | 1.4% |
Households
Families
MarriedFamilies
NonFamilies
Name | Median | Mean |
|---|---|---|
| Families | $74,821 | $78,877 |
| Households | $59,690 | $75,937 |
| Married Families | $87,276 | $-999,999,999 |
| Non Families | $39,095 | $63,573 |
mean
median
Married
Widowed
Divorced
Separated
NeverMarried
36.6%
Overall Marriage Rate
41.5%
Male Marriage Rate
32.4%
Female Marriage Rate
male
female
The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 55-64.
Married
Widowed
Divorced
Separated
NeverMarried
Second Gulf War
First Gulf War
Vietnam
Korea
World War II
320
Number of Veterans
310
Male Veterans
10
Female Veterans
War | Veterans |
|---|---|
| Vietnam | 86 |
| First Gulf War | 76 |
| Korea | 74 |
| Second Gulf War | 36 |
| World War II | 0 |
count
Age Group | Veterans |
|---|---|
| 75+ | 133 |
| 55 to 64 | 59 |
| 65 to 74 | 59 |
| 35 to 54 | 39 |
| 18 to 34 | 30 |
count
Name | Veterans | % of Total |
|---|---|---|
| White | 314 | 5.87% |
| Hispanic | 23 | 2.27% |
| Native American | 6 | 8.96% |
Less Than 9th Grade
High School Graduate
Some College
Bachelors or Greater
1.29%
Veteran Poverty Rate
42.72%
Veteran Disability Rate
LaborForceParticipation
63%
Labor Force Participation
58.5%
Employment Rate
7.2%
Unemployment Rate
LaborForceParticipation
LaborForceParticipation
Europe
Asia
Africa
Oceania
Latin America
North America
Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.
Europe
Asia
Africa
Oceania
Latin America
North America
65.36%
Born in Monmouth
89.38%
Native Born
10.62%
Foreign Born
4.07%
Non Citizen
6.55%
Naturalized
89.38% of Monmouth residents were born in the United States, with 65.36% having been born in Illinois. 4.07% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.
Year | Population | Growth | Change |
|---|---|---|---|
| 2029 | 7,909 | -109 | -1.36% |
| 2028 | 8,018 | -110 | -1.35% |
| 2027 | 8,128 | -110 | -1.34% |
| 2026 | 8,238 | -109 | -1.31% |
| 2025 | 8,347 | -110 | -1.3% |
| 2024 | 8,457 | -110 | -1.28% |
| 2023 | 8,567 | -90 | -1.04% |
| 2022 | 8,657 | -114 | -1.3% |
| 2021 | 8,771 | -125 | -1.41% |
| 2020 | 8,896 | 26 | 0.29% |
| 2019 | 8,870 | -84 | -0.94% |
| 2018 | 8,954 | -84 | -0.93% |
| 2017 | 9,038 | -83 | -0.91% |
| 2016 | 9,121 | -132 | -1.43% |
| 2015 | 9,253 | -127 | -1.35% |
| 2014 | 9,380 | 25 | 0.27% |
| 2013 | 9,355 | -71 | -0.75% |
| 2012 | 9,426 | -87 | -0.91% |
| 2011 | 9,513 | 89 | 0.94% |
| 2010 | 9,424 | 0 | 0% |
| 2000 | 9,841 | 352 | 3.71% |
| 1990 | 9,489 | -1,217 | -11.37% |
| 1980 | 10,706 | -316 | -2.87% |
| 1970 | 11,022 | 650 | 6.27% |
| 1960 | 10,372 | 179 | 1.76% |
| 1950 | 10,193 | 1,097 | 12.06% |
| 1940 | 9,096 | 430 | 4.96% |
| 1930 | 8,666 | 550 | 6.78% |
| 1920 | 8,116 | -1,012 | -11.09% |
| 1910 | 9,128 | 1,668 | 22.36% |
| 1900 | 7,460 | 1,524 | 25.67% |
| 1890 | 5,936 | 936 | 18.72% |
| 1880 | 5,000 | 338 | 7.25% |
| 1870 | 4,662 | 2,156 | 86.03% |
| 1860 | 2,506 | -5,403 | -68.31% |