Waterloo, Illinois Population 2024

11,238

Waterloo is a city located in Monroe County Illinois. Waterloo has a 2024 population of 11,238. It is also the county seat of Monroe County.Waterloo is currently growing at a rate of 0.48% annually and its population has increased by 2.12% since the most recent census, which recorded a population of 11,005 in 2020.

The average household income in Waterloo is $104,304 with a poverty rate of 5.03%. The median rental costs in recent years comes to - per month, and the median house value is -. The median age in Waterloo is 40 years, 38.6 years for males, and 41.5 years for females.

Waterloo Demographics

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

  • White: 96.34%
  • Asian: 1.26%
  • Two or more races: 1.05%
  • Black or African American: 0.89%
  • Native American: 0.23%
  • Other race: 0.23%
  • Native Hawaiian or Pacific Islander:
Land Area (mi²)
8.1 sq mi
Density (mi²)
1,381.20/sq mi
Growth Since 2020
2.12% (233)
The current population of Waterloo, Illinois is 11,238 based on our projections of the latest US Census estimates.The last official US Census in 2020 recorded the population at 11,005.

Waterloo, Illinois Population 2024

Population by Race

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Race
Population
Percentage (of total)
White10,60996.34%
Asian1391.26%
Two or more races1161.05%
Black or African American980.89%
Native American250.23%
Other race250.23%
Native Hawaiian or Pacific Islander
showing: 7 rows

White

Asian

Two or more races

Black or African American

Native American

Other race

Native Hawaiian or Pacific Islander

Waterloo Population by Race

Waterloo Population Pyramid 2024

Waterloo Median Age

40

Total

38.6

Male

41.5

Female

Waterloo Adults

There are 8,595 adults, (2,203 of whom are seniors) in Waterloo.

Waterloo Age Dependency

72.3

Age Dependency Ratio

34.5

Old Age Dependency Ratio

37.8

Child Dependency Ratio

Waterloo Sex Ratio

Female5,58650.73%
Male5,42649.27%

Waterloo Population by Age

Waterloo Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All4,3392.577.122.9
Married2,4183.0595.94.1
Non Family1,3261.2447.352.7
Female3723.1266.733.3
Male223368.231.8
showing: 5 rows

2.98

Average Family Size

2.5

Average Household Size

77.1%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Waterloo Households and Families

Male

Female

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Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

Waterloo Educational Attainment by Sex (over 25)

Waterloo Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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The highest rate of high school graduation is among asian people with a rate of 100%.

The highest rate of bachelors degrees is among other race people with a rate of 100%.

Waterloo Educational Attainment by Race

All

Male

Female

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$58,687

Average Earnings

$67,635

Average Male

$52,174

Average Female

Waterloo Earnings by Educational Attainment

Waterloo Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Waterloo Language

97.86% of Waterloo residents speak only English, while 2.14% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 0.92% of the population.

Waterloo Language

Waterloo Poverty by Race

rate

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Name
Total
In Poverty
Poverty Rate
White10,3804744.57%
Black795569.62%
Asian1391410.07%
showing: 3 rows

5.03%

Overall Poverty Rate

2.71%

Male Poverty Rate

7.34%

Female Poverty Rate

Poverty in Waterloo

The race most likely to be in poverty in Waterloo is Black, with 69.62% below the poverty level.

The race least likely to be in poverty in Waterloo is White, with 4.57% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 0.47%. Among those working part-time, it was 6.25%, and for those that did not work, the poverty rate was 12.66%.

Waterloo Poverty

rate

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Rate
Poverty
Less Than 9th Grade22.58%
High School6.96%
Bachelors or Greater2.73%
Some College2.33%
showing: 4 rows

Waterloo Poverty Rate by Education

rate

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Rate
Poverty
Male Unemployed29.03%
Female Employed2.3%
Male Employed
Female Unemployed
showing: 4 rows

Waterloo Poverty Rate by Employment Status and Sex

Waterloo Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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mean

median

Income by Household Type

Waterloo Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

53.9%

Overall Marriage Rate

54.4%

Male Marriage Rate

53.4%

Female Marriage Rate

Waterloo Married by Age and Sex

male

female

Waterloo 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 45-54.

Waterloo Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Waterloo Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

781

Number of Veterans

696

Male Veterans

85

Female Veterans

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Waterloo Veterans by War

count

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Waterloo Veterans by Age

count

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Waterloo Veterans by Race

Waterloo Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

0.91%

Veteran Poverty Rate

20.75%

Veteran Disability Rate

Waterloo Veterans by Education

LaborForceParticipation

65.8%

Labor Force Participation

63.9%

Employment Rate

3%

Unemployment Rate

Waterloo Employment by Age

LaborForceParticipation

Waterloo Employment by Race

LaborForceParticipation

Waterloo Employment by Education

Origin of Non-Citizens

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.

Origin of Naturalized Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

60.13%

Born in Waterloo

98.55%

Native Born

1.45%

Foreign Born

0.29%

Non Citizen

1.16%

Naturalized

Place of Birth

98.55% of Waterloo residents were born in the United States, with 60.13% having been born in Illinois. 0.29% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Waterloo Place of Birth

Note: data after 2022 is projected based on recent change

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Year
Population
Growth
Growth Rate
202911,508540.47%
202811,454540.47%
202711,400540.48%
202611,346540.48%
202511,292540.48%
202411,238540.48%
202311,184540.49%
202211,130540.49%
202111,076710.65%
202011,0054404.16%
201910,5651171.12%
201810,448840.81%
201710,3641201.17%
201610,244810.8%
201510,163660.65%
201410,097-5-0.05%
201310,102410.41%
201210,061140.14%
201110,047770.77%
20109,9702,35630.94%
20007,6142,54250.12%
19905,0724269.17%
19804,6461002.2%
19704,54680721.58%
19603,73991832.54%
19502,821
showing: 26 rows

Waterloo Population by Year