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
Waterloo covers 8.3 sq mi of land at 1334 people per square mile.
About Waterloo, IL
Waterloo is a city in Illinois with a population of 11,055. It ranks #208 among cities in Illinois by population. The median age is 40.2, older than the national median. The population is 49.2% male and 50.8% female.
The median household income in Waterloo is $92,005, above the US median of $74,580. 4.7% of residents live below the federal poverty level. Home values sit at a median of $237,900, with monthly rent averaging $873. The homeownership rate of 76.9% is higher than the national rate of 64.8%.
Educational attainment in Waterloo reflects 36.4% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 11.6% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 26.9 minutes each way.
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%.
11,165
Population (2024)
9,994
Population (2010)
11,202
Peak (2023)
0.80%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 9,994 |
| 2011 | 10,070 |
| 2012 | 10,083 |
| 2013 | 10,124 |
| 2014 | 10,117 |
| 2015 | 10,183 |
| 2016 | 10,249 |
| 2017 | 10,381 |
| 2018 | 10,470 |
| 2019 | 10,578 |
| 2020 | 11,004 |
| 2021 | 11,081 |
| 2022 | 11,150 |
| 2023 | 11,202 |
| 2024 | 11,165 |
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
Largest counties in Illinois
Part of Illinois
Metro areas in Illinois
City 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).
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.