Waterloo, Illinois Population 2026

Updated April 2026 · US Census ACS 2023 5-Year Estimates

The population of Waterloo, Illinois is 11,055 as of the 2023 American Community Survey, making it the 208th-largest city in Illinois. The median household income is $92,005, the median home value is $237,900, and the median age is 40.2.

The population has grown 11.7% since 2010 (9,994 → 11,165).

11,055

Population

1334

People / sq mi

$92,005

Median Income

$237,900

Median Home Value

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Waterloo covers 8.3 sq mi of land at 1334 people per square mile.

About Waterloo, IL

Waterloo is distinguished by its share of foreign-born residents, 40.4% of the population. Waterloo is a city in Illinois with a population of 11,055.

Household earnings are middling, with a median of $92,005 — above the US median of $78,538. About 4.7% of residents live below the federal poverty level, below the national 12.4%. Homes carry a median value of $237,900, with typical rent around $873.

Roughly 36.4% of adults have a bachelor’s, near the national 35.0%. Around 11.6% of workers work from home, below the national 14.0%, and the average commute runs about 27 minutes each way.

The large foreign-born share is a defining thread in Waterloo, shaping language, household composition, and the labor force behind the economic figures above.

Waterloo city Population History (2010-2024)

The city of Waterloo city had a population of 9,994 in 2010 and 11,165 in 2024, a 11.7% growth over 14 years. The peak was 11,202 in 2023. Average annual growth rate: 0.80%.

Waterloo city population, 2010–2024 · Source: U.S. Census Bureau — decennial census & Population Estimates

11,165

Population (2024)

9,994

Population (2010)

11,202

Peak (2023)

0.80%

Avg Annual Growth

Year	Population	Change	Annual %	Source
2010	9,994	-	-	estimate
2011	10,070	+76	+0.76%	estimate
2012	10,083	+13	+0.13%	estimate
2013	10,124	+41	+0.41%	estimate
2014	10,117	-7	-0.07%	estimate
2015	10,183	+66	+0.65%	estimate
2016	10,249	+66	+0.65%	estimate
2017	10,381	+132	+1.29%	estimate
2018	10,470	+89	+0.86%	estimate
2019	10,578	+108	+1.03%	estimate
2020	11,004	+426	+4.03%	estimate
2021	11,081	+77	+0.70%	estimate
2022	11,150	+69	+0.62%	estimate
2023	11,202	+52	+0.47%	estimate
2024	11,165	-37	-0.33%	estimate

Race & Ethnicity

White	95.9%
Black or African American	0.8%
Asian	0.0%
Hispanic or Latino (any race)	0.6%
Two or More Races	0.0%

Economy & Income

$92,005

Median Household Income

$44,435

Per Capita Income

4.7%

Poverty Rate

2.2%

Unemployment Rate

Housing

$237,900

Median Home Value

$873

Median Rent

76.9%

Owner-Occupied

Education

96.2%

High School+

36.4%

Bachelor's+

Commute

0.0%

Drive Alone

76.8%

Public Transit

11.6%

Work From Home

26.9 min

Avg Commute

Community Profile

40.4%

Foreign Born

98.6%

Non-English at Home

8.7%

Veterans

14.5%

With Disability

97.0%

Health Insurance

96.0%

Internet Access

Employment by Industry

Professional, Scientific & Management	27.1%
Information	10.8%
Education, Health Care & Social Services	10.4%
Manufacturing	9.3%
Retail Trade	8.2%
Finance, Insurance & Real Estate	5.0%
Public Administration	4.5%
Agriculture & Mining	3.9%
Construction	3.3%
Arts, Entertainment & Food Services	2.2%
Transportation & Warehousing	1.3%

Largest cities in Illinois

Chicago (2,707,648)Aurora (179,867)Joliet (149,785)Naperville (149,424)Rockford (147,649)Elgin (114,106)Springfield (113,714)Peoria (112,126)Waukegan (88,919)Champaign (88,822)View all Illinois cities →

Largest counties in Illinois

Cook County (5,185,812)DuPage County (927,263)Lake County (711,885)Will County (698,450)Kane County (516,097)

Part of Illinois

Illinois demographic profile All Illinois data →

Metro areas in Illinois

Chicago (9,359,555)St. Louis (2,809,414)Davenport (381,864)Peoria (365,773)Rockford (336,605)Champaign (236,196)Springfield (207,386)Bloomington (170,882)All US metros →

City rankings

US Cities by Population Cities With Highest Median Income Expensive US Cities by Home Value Youngest US Cities by Median Age Racially Diverse US Cities Cities With Highest Rent Educated US Cities Cities With Highest Work From Home Rates Cheapest US Cities by Median Home Value Cities With Lowest Rent All rankings →

Frequently Asked Questions

Waterloo, Illinois has a population of 11,055 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 208th-largest city in Illinois.

The median household income in Waterloo, Illinois is $92,005, with 4.7% of residents living below the federal poverty level.

The median home value in Waterloo, Illinois is $237,900, with median monthly rent at $873 and a homeownership rate of 76.9%.

The median age in Waterloo, Illinois is 40.2 years. The population is 49.2% male and 50.8% female.

The population has grown 11.7% since 2010 (9,994 → 11,165).

Where to stay in Waterloo

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More from Illinois

Population 2,707,648

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Population 149,424

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All cities in Illinois

Full rankings of Illinois cities by population

Illinois demographic profile

Statewide data for Illinois

Illinois demographics 2026 — complete guide

Population, race, income, age, and trends across Illinois

Sources: US Census Bureau ACS 5-Year Estimates

Data from the American Community Survey (ACS) 5-Year estimates.

Source: U.S. Census Bureau ACS, 2026.