Monmouth township is located in Warren County Illinois. Monmouth township has a 2024 population of 9,467. Monmouth township is currently declining at a rate of -1.07% annually and its population has decreased by -4.73% since the most recent census, which recorded a population of 9,937 in 2020.
The average household income in Monmouth township is $81,697 with a poverty rate of 15.17%. The median age in Monmouth township is 35.8 years: 34.5 years for males, and 38.2 years for females.
According to the most recent ACS, the racial composition of Monmouth township was:
Race | Population | Percentage (of total) |
|---|---|---|
| White | 7,560 | 77.25% |
| Other race | 711 | 7.26% |
| Two or more races | 486 | 4.97% |
| Black or African American | 412 | 4.21% |
| Asian | 356 | 3.64% |
| Native American | 197 | 2.01% |
| Native Hawaiian or Pacific Islander | 65 | 0.66% |
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 | 3,774 | 2.35 | 74.9 | 25.1 |
| Married | 1,538 | 2.99 | 92.3 | 7.7 |
| Non Family | 1,353 | 1.13 | 59.6 | 40.4 |
| Female | 669 | 3.12 | 66.2 | 33.8 |
| Male | 214 | 2.93 | 73.4 | 26.6 |
2.92
Average Family Size
2.35
Average Household Size
74.9%
Rate of Home Ownership
Married
Male
Female
NonFamily
owner
renter
Male
Female
Education Attained | Count | Percentage |
|---|---|---|
| 9th to 12th Grade | 674 | 11.15% |
| Associates Degree | 482 | 7.97% |
| Bachelors Degree | 825 | 13.65% |
| Graduate Degree | 465 | 7.69% |
| High School Graduate | 2,042 | 33.77% |
| Less Than 9th Grade | 394 | 6.52% |
| Some College | 1,164 | 19.25% |
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 | 4,760 | 4,243 | 1,132 |
| Hispanic | 805 | 447 | 114 |
| Other Race | 365 | 130 | 31 |
| Black | 223 | 202 | 39 |
| 2+ Races | 178 | 142 | 40 |
| Asian | 165 | 0 | 0 |
| 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 white people with a rate of 23.78%.
All
Male
Female
Name | Average | Male | Female |
|---|---|---|---|
| Bachelors Degree | $47,188 | $63,375 | $38,833 |
| Graduate Degree | $60,764 | $77,054 | $51,538 |
| High School Graduate | $40,099 | $48,362 | $27,672 |
| Less Than 9th Grade | $49,770 | $57,927 | $33,333 |
| Overall | $41,178 | $54,777 | $33,382 |
| Some College | $36,078 | $47,135 | $27,500 |
$41,178
Average Earnings
$54,777
Average Male
$33,382
Average Female
Only English
Spanish
Other Indo-European Languages
Asian and Pacific Island Languages
Other Languages
84.1% of Monmouth township residents speak only English, while 15.9% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 10.87% of the population.
rate
Name | Total | In Poverty | Poverty Rate |
|---|---|---|---|
| White | 6,413 | 727 | 11.34% |
| Hispanic | 1,593 | 561 | 35.22% |
| Other | 691 | 292 | 42.26% |
| Native | 197 | 157 | 79.7% |
| Multiple | 427 | 75 | 17.56% |
| Black | 326 | 12 | 3.68% |
15.17%
Overall Poverty Rate
14.36%
Male Poverty Rate
15.95%
Female Poverty Rate
The race most likely to be in poverty in Monmouth township is Native, with 79.7% below the poverty level.
The race least likely to be in poverty in Monmouth township is Black, with 3.68% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 1.19%. Among those working part-time, it was 12.38%, and for those that did not work, the poverty rate was 22.65%.
rate
Rate | Poverty |
|---|---|
| Less Than 9th Grade | 15.88% |
| High School | 10.95% |
| Some College | 10.94% |
| Bachelors or Greater | 3.52% |
rate
Rate | Poverty |
|---|---|
| Female Unemployed | 12.38% |
| Female Employed | 7.6% |
| Male Unemployed | 4.66% |
| Male Employed | 1.25% |
Households
Families
MarriedFamilies
NonFamilies
Name | Median | Mean |
|---|---|---|
| Families | $77,951 | $88,786 |
| Households | $60,911 | $81,697 |
| Married Families | $94,533 | $-999,999,999 |
| Non Families | $40,943 | $62,387 |
mean
median
Married
Widowed
Divorced
Separated
NeverMarried
41.3%
Overall Marriage Rate
45.5%
Male Marriage Rate
37.6%
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
383
Number of Veterans
365
Male Veterans
18
Female Veterans
War | Veterans |
|---|---|
| Vietnam | 107 |
| First Gulf War | 86 |
| Korea | 84 |
| Second Gulf War | 44 |
| World War II | 0 |
count
Age Group | Veterans |
|---|---|
| 75+ | 152 |
| 55 to 64 | 73 |
| 65 to 74 | 71 |
| 35 to 54 | 57 |
| 18 to 34 | 30 |
count
Name | Veterans | % of Total |
|---|---|---|
| White | 377 | 6.2% |
| Hispanic | 23 | 2.2% |
| Native American | 6 | 8.96% |
Less Than 9th Grade
High School Graduate
Some College
Bachelors or Greater
1.08%
Veteran Poverty Rate
40.86%
Veteran Disability Rate
LaborForceParticipation
61.7%
Labor Force Participation
57.6%
Employment Rate
6.6%
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
67.8%
Born in Monmouth township
90.13%
Native Born
9.87%
Foreign Born
3.82%
Non Citizen
6.05%
Naturalized
90.13% of Monmouth township residents were born in the United States, with 67.8% having been born in Illinois. 3.82% 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 | 8,957 | -102 | -1.13% |
| 2028 | 9,059 | -102 | -1.11% |
| 2027 | 9,161 | -102 | -1.1% |
| 2026 | 9,263 | -102 | -1.09% |
| 2025 | 9,365 | -102 | -1.08% |
| 2024 | 9,467 | -102 | -1.07% |
| 2023 | 9,569 | -102 | -1.05% |
| 2022 | 9,671 | -128 | -1.31% |
| 2021 | 9,799 | -138 | -1.39% |
| 2020 | 9,937 | 57 | 0.58% |
| 2019 | 9,880 | -93 | -0.93% |
| 2018 | 9,973 | -93 | -0.92% |
| 2017 | 10,066 | -90 | -0.89% |
| 2016 | 10,156 | -134 | -1.3% |
| 2015 | 10,290 | -143 | -1.37% |
| 2014 | 10,433 | 29 | 0.28% |
| 2013 | 10,404 | -72 | -0.69% |
| 2012 | 10,476 | -86 | -0.81% |
| 2011 | 10,562 | 95 | 0.91% |
| 2010 | 10,467 | 0 | 0% |