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Waterloo, IL
City in Monroe County, Illinois.
Population
11,129
Land area
8.3sq mi
People per sq mi
1,343
ZIP codes
0
Waterloo and its ZIP codes
Waterloo at a glance
- Waterloo is about 5.9 times as dense as Illinois as a whole.
- By population, it ranks 208th among 1,445 cities and towns in Illinois.
- The median household income is $98,711, 18% above the Illinois median of $83,390.
- A typical owner-occupied home is valued at $249,500 (5% below Illinois) and median rent is $886 a month.
Local data for Waterloo, IL
Counts from official public data
Housing and community stats
Waterloo, IL, American Community Survey 2020-2024
Median household income
$98,711
Poverty rate
5.9%
Median home value
$249,500
Median rent
$886/mo
Homeownership
78.2%
Bachelor's or higher
37.3%
Median age
41.5
Average commute
26.8 min
Largest reported origins and ancestries: German Americans (4,685), Irish Americans (1,851), Polish Americans (478).
Economy and federal money
Jobs, pay, income and spending are for Monroe County. PPP loans are for Waterloo.
Unemployment rate
2.5%
Aug 2026, -0.8 pts in a year
Average annual pay
$51,694
8,577 jobs, 2025
Income per person
$77,807
BEA, 2024
Federal spending
$257M
FY 2026, $7,342 per person
How people get to work
Waterloo, IL, workers 16 and older. American Community Survey 5-year estimates
- Drove alone77.4%
- Carpooled7.9%
- Public transit0.0%
- Walked1.2%
- Bicycle0.0%
- Taxi, ride-hailing, motorcycle or other0.5%
- Worked from home12.9%
Average one-way commute: 26.8 minutes for people who do not work from home.
Environment and hazard risk
Waterloo, IL, from FEMA, NOAA and EPA
Natural hazard risk
Very Low
Top: heat wave
Storm events since 1996
387
Countywide, mostly hail
Flood insurance policies
135
0.9% of homes, county
July high / Jan low
88° / 22°F
43.6 inches of rain a year
Hazards, floods and storm historyCheck a flood zone1 historic places
Health statistics
Share of adults in Waterloo, IL, CDC PLACES estimates
Obesity
35.2%
U.S. 33.3% +1.9 pts
Diabetes
10.1%
U.S. 12.1% -2.0 pts
Smoking
11.4%
U.S. 12.8% -1.4 pts
Uninsured (18-64)
5.8%
U.S. 11.1% -5.3 pts
Cities near Waterloo
| Name | Distance | Land area (sq mi) |
|---|---|---|
| FloravilleCensus-designated place | 5.6 mi | 0.1 |
| PaderbornCensus-designated place | 5.7 mi | 0.2 |
| MillstadtVillage | 8.3 mi | 3.6 |
| ColumbiaCity | 8.4 mi | 10.6 |
| ValmeyerVillage | 8.5 mi | 3.4 |
| HeckerVillage | 8.8 mi | 0.3 |
| MaeystownVillage | 9.1 mi | 0.3 |
| SmithtonVillage | 10 mi | 4.5 |
| Oakville, MOCensus-designated place | 11 mi | 15.9 |
| Kimmswick, MOCity | 12 mi | 0.2 |
| Imperial, MOCensus-designated place | 13 mi | 5.2 |
| DupoVillage | 13 mi | 6.4 |
| Red BudCity | 13 mi | 2.6 |
| FultsVillage | 13 mi | 0.1 |
| FreeburgVillage | 13 mi | 6.8 |
| Arnold, MOCity | 13 mi | 11.5 |
Frequently asked questions
- What county is Waterloo, IL in?
- Waterloo is in Monroe County, Illinois.
- What is the population of Waterloo, IL?
- About 11,129 people live in Waterloo, based on American Community Survey 5-year estimates.
- What cities are near Waterloo?
- Nearby places include Floraville (5.6 mi), Paderborn (5.7 mi), Millstadt (8.3 mi), Columbia (8.4 mi), Valmeyer (8.5 mi).
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023