Waterloo, Illinois Population 2021

10,794
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Waterloo is a city located in Monroe County Illinois. It is also the county seat of Monroe County. With a 2020 population of 10,794, it is the 208th largest city in Illinois and the 2940th largest city in the United States . Waterloo is currently growing at a rate of 1.01% annually and its population has increased by 10.02% since the most recent census, which recorded a population of 9,811 in 2010. Waterloo reached it's highest population of 10,794 in 2021. Spanning over 8 miles, Waterloo has a population density of 1,327 people per square mile.

The average household income in Waterloo is $80,986 with a poverty rate of 3.73%. The median rental costs in recent years comes to $830 per month, and the median house value is $192,100. The median age in Waterloo is 40.4 years, 41.2 years for males, and 39.7 years for females.

Waterloo Demographics

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

  • White: 97.30%
  • Asian: 1.45%
  • Two or more races: 0.56%
  • Other race: 0.38%
  • Black or African American: 0.32%
  • Native American: 0.00%
  • Native Hawaiian or Pacific Islander: 0.00%
The current population of Waterloo, Illinois is 10,794 based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 10,470.The last official US Census in 2010 recorded the population at 9,811.

Waterloo, Illinois Population 2021

Population by Race

Race Population Percentage
White10,08797.30%
Asian1501.45%
Two or More Races580.56%
Some Other Race390.38%
Black or African American330.32%
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Waterloo Population by Race

Waterloo Population Pyramid $2021

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Waterloo Median Age

40.4


Total

41.2


Male

39.7


Female

Waterloo Adults

There are 8,037 adults, (2,046 of whom are seniors) in Waterloo.

Waterloo Age Dependency

73

Age Dependency Ratio

34.2

Old Age Dependency Ratio

38.9

Child Dependency Ratio

Waterloo Sex Ratio

Female

5,523

53.27%

Male

4,844

46.73%

Waterloo Population by Age

Waterloo Renter vs Owner Occupied by Household Type

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Waterloo Household Types

Type Owner Renter
Married92.4%7.6%
All75%25%
Female70.9%29.1%
Non Family53%47%
Male41.2%58.8%

75.0%

Rate of Home Ownership

Waterloo Households and Families

Type Count Average Size Owned
All4,3022.3875
Married2,3463.0392.4
Non Family1,3681.1453
Female3092.6770.9
Male2792.5641.2

2.92

Average Family Size

2.38

Average Household Size

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Waterloo Households by Type

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Education Attained Count Percentage
Less Than 9th Grade1071.46%
9th to 12th Grade2002.73%
High School Graduate2,25630.74%
Some College1,77424.18%
Associates Degree7079.63%
Bachelors Degree1,59921.79%
Graduate Degree6959.47%
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Waterloo Educational Attainment by Sex (over 25)

Waterloo Educational Attainment by Race

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Race Total High School Bachelors
White7,0186,7132,173
Hispanic14814835
Asian10310352
Other Race393926
2+ Races363612
Black333122

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

The highest rate of bachelors degrees is among other race people with a rate of 66.67%.

Waterloo Educational Attainment by Race

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Name Average Male Female
Overall$48,277$54,810$37,273
Less Than 9th Grade$2,500$$
High School Graduate$28,056$31,346$26,339
Some College$49,754$65,830$32,083
Bachelors Degree$56,058$76,522$52,885
Graduate Degree$64,245$96,200$63,113

$48,277

Average Earnings

$54,810

Average Male

$37,273

Average Female

Waterloo Earnings by Educational Attainment

Waterloo Language by Age

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Waterloo Language

97.20% of Waterloo residents speak only English, while 2.80% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 1.24% of the population.

Waterloo Language

Waterloo Poverty by Race

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Name Total In Poverty Poverty Rate
White9,7743623.70%
Hispanic201167.96%
Black15213.33%

3.73%

Overall Poverty Rate

3.38%

Male Poverty Rate

4.04%

Female Poverty Rate

Poverty in Waterloo

The race most likely to be in poverty in Waterloo is Black, with 13.33% below the poverty level.

The race least likely to be in poverty in Waterloo is White, with 3.70% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.92%. Among those working part-time, it was 3.75%, and for those that did not work, the poverty rate was 8.30%.

Waterloo Poverty

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Name Poverty
High School9.99%
Less Than 9th Grade6.72%
Some College2.76%
Bachelors or Greater0.00%

Waterloo Poverty Rate by Education

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Rate Poverty
Male Employed3.31%
Female Employed1.46%
Female Unemployed0.00%
Male Unemployed0.00%

Waterloo Poverty Rate by Employment Status and Sex

Waterloo Income by Household Type

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Name Median Mean
Households$67,682$80,986
Families$89,102$97,905
Married Families$95,045-
Non Families$34,231$43,832
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Income by Household Type

Waterloo Marital Status

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Marriage Rates

58.3%

Overall Marriage Rate

59.4%

Male Marriage Rate

57.3%

Female Marriage Rate

Waterloo Married by Age and Sex

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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

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Waterloo Marital Status

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640

Number of Veterans

619

Male Veterans

21

Female Veterans

War Veterans
Vietnam170
Korea142
First Gulf War118
Second Gulf War76
World War II23

Waterloo Veterans by War

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Age Group Veterans
75+256
65 to 74179
35 to 5495
18 to 3458
55 to 6452

Waterloo Veterans by Age

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Waterloo Veterans by Race

Waterloo Veterans by Education

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5.14%

Veteran Poverty Rate

25.24%

Veteran Disability Rate

Waterloo Veterans by Education

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63.5%

Labor Force Participation

61.4%

Employment Rate

3.2%

Unemployment Rate

Waterloo Employment by Age

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Waterloo Employment by Race

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Waterloo 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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58.20%

Born in Waterloo

98.44%

Native Born

1.56%

Foreign Born

0.15%

Non Citizen

1.41%

Naturalized

Place of Birth

98.44% of Waterloo residents were born in the United States, with 58.20% having been born in Illinois. 0.15% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Waterloo Place of Birth

Year Population Growth Annual Growth Rate
202110,7941081.01%
202010,6861081.02%
201910,5781081.03%
201810,470890.86%
201710,3811321.29%
201610,249660.65%
201510,183660.65%
201410,117-7-0.07%
201310,124410.41%
201210,083130.13%
201110,070760.76%
20109,9942,3802.76%
20007,6142,5424.15%
19905,0724260.88%
19804,6461000.22%
19704,5468071.97%
19603,7399182.86%
19502,8210.00%

Waterloo Population by Year