Monmouth, Illinois Population 2022

8,794
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Monmouth is a city located in Warren County Illinois. It is also the county seat of Warren County. With a 2020 population of 8,794, it is the 247th largest city in Illinois and the 4511th largest city in the United States. Monmouth is currently declining at a rate of -0.61% annually and its population has decreased by -1.21% since the most recent census, which recorded a population of 8,902 in 2020. Spanning over 4 miles, Monmouth has a population density of 2,094 people per square mile.

The average household income in Monmouth is $55,336 with a poverty rate of 15.98%. The median rental costs in recent years comes to $580 per month, and the median house value is $79,200. The median age in Monmouth is 35.8 years, 35.2 years for males, and 36.5 years for females.

Monmouth Demographics

According to the most recent ACS, the racial composition of Monmouthwas:

  • White: 81.87%
  • Black or African American: 6.76%
  • Other race: 4.57%
  • Two or more races: 2.65%
  • Asian: 2.18%
  • Native American: 1.97%
  • Native Hawaiian or Pacific Islander: 0.00%
The current population of Monmouth, Illinois is 8,794 based on our projections of the latest US Census estimates.The last official US Census in 2020 recorded the population at 8,902.

Monmouth, Illinois Population 2022

Population by Race

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Monmouth Population by Race

Monmouth Population Pyramid 2022

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Monmouth Median Age

36.5


Total

34.9


Male

38.1


Female

Monmouth Adults

There are 6,886 adults, (1,498 of whom are seniors) in Monmouth.

Monmouth Age Dependency

Age Dependency Ratio

27.8

Old Age Dependency Ratio

36.2

Child Dependency Ratio

Monmouth Sex Ratio

Female

4,641

52.52%

Male

4,196

47.48%

Monmouth Population by Age

Monmouth Renter vs Owner Occupied by Household Type

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Monmouth Household Types

66.8%

Rate of Home Ownership

Monmouth Households and Families

2.87

Average Family Size

2.28

Average Household Size

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Monmouth Households by Type

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Monmouth Educational Attainment by Sex (over 25)

Monmouth Educational Attainment by Race

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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 23.21%.

Monmouth Educational Attainment by Race

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$30,920

Average Earnings

$41,250

Average Male

$25,770

Average Female

Monmouth Earnings by Educational Attainment

Monmouth Language by Age

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Monmouth Language

85.41% of Monmouth residents speak only English, while 14.59% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 7.89% of the population.

Monmouth Language

Monmouth Poverty by Race

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15.98%

Overall Poverty Rate

15.81%

Male Poverty Rate

16.14%

Female Poverty Rate

Poverty in Monmouth

The race most likely to be in poverty in Monmouth is Native, with 63.22% below the poverty level.

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

The poverty rate among those that worked full-time for the past 12 months was 2.00%. Among those working part-time, it was 24.18%, and for those that did not work, the poverty rate was 17.47%.

Monmouth Poverty

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Monmouth Poverty Rate by Education

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Monmouth Poverty Rate by Employment Status and Sex

Monmouth Income by Household Type

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Income by Household Type

Monmouth Marital Status

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Marriage Rates

39.0%

Overall Marriage Rate

42.8%

Male Marriage Rate

35.8%

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 45-54, while the female age group most likely to be married is 55-64.

Monmouth Marital Status by Race

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Monmouth Marital Status

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457

Number of Veterans

Male Veterans

Female Veterans

Monmouth Veterans by War

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Monmouth Veterans by Age

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Monmouth Veterans by Race

Monmouth Veterans by Education

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5.38%

Veteran Poverty Rate

34.30%

Veteran Disability Rate

Monmouth Veterans by Education

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62.7%

Labor Force Participation

54.4%

Employment Rate

13.2%

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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65.33%

Born in Monmouth

91.21%

Native Born

8.79%

Foreign Born

4.72%

Non Citizen

4.07%

Naturalized

Place of Birth

91.21% of Monmouth residents were born in the United States, with 65.33% having been born in Illinois. 4.72% 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

Note: 2021 and 2022 data is projected

Monmouth Population by Year