Monmouth, Illinois Population 2021

9,724
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Monmouth is a city located in Warren County Illinois. Monmouth has a 2020 population of 9,724. It is also the county seat of Warren County. Monmouth is currently declining at a rate of -0.87% annually and its population has decreased by -7.10% since the most recent census, which recorded a population of 10,467 in 2010. Monmouth reached it's highest population of 10,564 in 2011.

The average household income in Monmouth is $57,025 with a poverty rate of 16.12%. The median rental costs in recent years comes to $621 per month, and the median house value is $79,900. The median age in Monmouth is 36.2 years, 35.7 years for males, and 36.6 years for females.

Monmouth Demographics

According to the most recent ACS, the racial composition of Monmouth was:

  • White: 82.25%
  • Other race: 7.96%
  • Black or African American: 4.59%
  • Asian: 3.74%
  • Two or more races: 1.15%
  • Native American: 0.31%
  • Native Hawaiian or Pacific Islander: 0.00%
The current population of Monmouth, Illinois is 9,724 based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 9,979.The last official US Census in 2010 recorded the population at 10,467.

Monmouth, Illinois Population 2021

Population by Race

Race Population Percentage
White8,28882.25%
Some Other Race8027.96%
Black or African American4624.59%
Asian3773.74%
Two or More Races1161.15%
American Indian and Alaska Native310.31%
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Monmouth Population by Race

Monmouth Population Pyramid $2021

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Monmouth Median Age

36.2


Total

35.7


Male

36.6


Female

Monmouth Adults

There are 7,826 adults, (1,660 of whom are seniors) in Monmouth.

Monmouth Age Dependency

63.4

Age Dependency Ratio

26.9

Old Age Dependency Ratio

36.5

Child Dependency Ratio

Monmouth Sex Ratio

Female

5,429

53.88%

Male

4,647

46.12%

Monmouth Population by Age

Monmouth Renter vs Owner Occupied by Household Type

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Monmouth Household Types

Type Owner Renter
Married83.1%16.9%
All68.1%31.9%
Male62.2%37.8%
Female58.6%41.4%
Non Family57.2%42.8%

68.1%

Rate of Home Ownership

Monmouth Households and Families

Type Count Average Size Owned
All3,9782.2668.1
Married1,5882.8983.1
Non Family1,4541.0757.2
Female6953.2258.6
Male2412.5962.2

2.88

Average Family Size

2.26

Average Household Size

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Monmouth Households by Type

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Education Attained Count Percentage
Less Than 9th Grade4417.13%
9th to 12th Grade78912.75%
High School Graduate1,89130.56%
Some College1,24720.16%
Associates Degree4156.71%
Bachelors Degree88614.32%
Graduate Degree5188.37%
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Monmouth Educational Attainment by Sex (over 25)

Monmouth Educational Attainment by Race

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Race Total High School Bachelors
White4,9344,2751,209
Hispanic744334111
Other Race41818226
Asian23911858
Black17213226
Native American1212
2+ Races77

The highest rate of high school graduation is among native american people with a rate of 100.00%.

The highest rate of bachelors degrees is among white people with a rate of 24.50%.

Monmouth Educational Attainment by Race

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Name Average Male Female
Overall$33,947$41,750$26,991
Less Than 9th Grade$30,606$27,273$32,188
High School Graduate$27,372$41,063$17,440
Some College$27,414$39,375$25,931
Bachelors Degree$46,601$49,583$44,083
Graduate Degree$45,956$51,019$43,824

$33,947

Average Earnings

$41,750

Average Male

$26,991

Average Female

Monmouth Earnings by Educational Attainment

Monmouth Language by Age

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Monmouth Language

84.13% of Monmouth residents speak only English, while 15.87% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 9.89% of the population.

Monmouth Language

Monmouth Poverty by Race

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Name Total In Poverty Poverty Rate
White6,7721,13016.69%
Hispanic1,41024617.45%
Other78415619.90%
Black3103912.58%
Multiple1132623.01%
Asian331175.14%

16.12%

Overall Poverty Rate

13.63%

Male Poverty Rate

18.22%

Female Poverty Rate

Poverty in Monmouth

The race most likely to be in poverty in Monmouth is Multiple, with 23.01% below the poverty level.

The race least likely to be in poverty in Monmouth is Asian, with 5.14% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.68%. Among those working part-time, it was 24.94%, and for those that did not work, the poverty rate was 19.98%.

Monmouth Poverty

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Name Poverty
Some College16.49%
Less Than 9th Grade16.21%
High School15.66%
Bachelors or Greater1.43%

Monmouth Poverty Rate by Education

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Rate Poverty
Female Unemployed58.45%
Male Unemployed46.51%
Female Employed10.84%
Male Employed5.46%

Monmouth Poverty Rate by Employment Status and Sex

Monmouth Income by Household Type

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Name Median Mean
Households$44,290$57,025
Families$51,392$65,123
Married Families$66,613-
Non Families$32,747$38,382
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Income by Household Type

Monmouth Marital Status

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Marriage Rates

42.4%

Overall Marriage Rate

45.3%

Male Marriage Rate

39.8%

Female Marriage Rate

Monmouth Married by Age and Sex

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Monmouth Marriage

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 35-44.

Monmouth Marital Status by Race

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Monmouth Marital Status

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482

Number of Veterans

461

Male Veterans

21

Female Veterans

War Veterans
Vietnam217
Korea81
First Gulf War68
Second Gulf War34
World War II

Monmouth Veterans by War

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Age Group Veterans
65 to 74167
55 to 64115
75+111
35 to 5459
18 to 3430

Monmouth Veterans by Age

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Name Veterans % of Total
White4767.08%
Hispanic242.54%
Black61.75%

Monmouth Veterans by Race

Monmouth Veterans by Education

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3.98%

Veteran Poverty Rate

31.24%

Veteran Disability Rate

Monmouth Veterans by Education

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62%

Labor Force Participation

55.5%

Employment Rate

10.4%

Unemployment Rate

Monmouth Employment by Age

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Monmouth Employment by Race

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Monmouth Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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68.67%

Born in Monmouth

90.65%

Native Born

9.35%

Foreign Born

6.12%

Non Citizen

3.23%

Naturalized

Place of Birth

90.65% of Monmouth residents were born in the United States, with 68.67% having been born in Illinois. 6.12% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Monmouth Place of Birth

Year Population Growth Annual Growth Rate
20219,724-85-0.87%
20209,809-85-0.86%
20199,894-85-0.85%
20189,979-92-0.91%
201710,071-92-0.91%
201610,163-132-1.28%
201510,295-141-1.35%
201410,436320.31%
201310,404-74-0.71%
201210,478-86-0.81%
201110,564970.93%
201010,4670.00%

Monmouth Population by Year