Waterloo is a city in Monroe County, Illinois, home to about 11,129 people across 8.1 square miles. Its ZIP code is 62298.
Homes sold for a median of $158 per square foot in the three months ending August 2026, a seller’s market.
Mostly Waterloo; also Paderborn and Floraville
Each card is that ZIP code’s whole market, including any part outside Waterloo. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Waterloo’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | St. Louis Lambert International Airport (STL)32 miles away |
|---|---|
| Closer regional airport | Scott AFB/Midamerica Airport (BLV)23 miles away |
| Nearest city of 250,000+ | St. Louis, MO22 miles away |
| Nearest city of 1 million+ | Chicago, IL275 miles away |
Straight-line distances from the center of Waterloo; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Waterloo had 11,013 residents in the 2020 census, up 45% since 2000.
It’s the 207th largest of 1,450 towns in Illinois by population.
Monroe County grew from 13,847 residents in 1900 to 34,962 in 2020.
Monroe County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 88°F in summer, and winter lows average 22°F. About 43.5 inches of rain and melted snow fall in a typical year, with about 9 inches of snow.
Source: NOAA 1991–2020 climate normals, Festus, MO weather station (15 miles away).
8,455 jobs at 875 businesses in Monroe County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
126 doctors and other health care providers list an office in Waterloo.
Nearest hospitals
Providers with an office here
| Primary care doctors | 5 |
|---|---|
| Specialist doctors | 4 |
| Dentists | 8 |
| Nurse practitioners and physician assistants | 23 |
| Mental health providers | 45 |
| Physical and occupational therapists | 23 |
| Optometrists | 2 |
| Chiropractors | 16 |
| Pharmacies | 4 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (7 nearby)
Grocery stores
Libraries (1 nearby)
Museums (2 nearby)
Theaters and performance venues (1 nearby)
Counts are within about 2 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1818.
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Waterloo CUSD 5. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| W J Zahnow Elem SchoolWaterloo | Pre-K–1 | 487 | Public | 1.4 mi |
| Rogers Elem SchoolWaterloo | 2–3 | 417 | Public | 1.1 mi |
| Gardner Elementary SchoolWaterloo | 4–5 | 374 | Public | 1.0 mi |
| Waterloo Junior High SchoolWaterloo | 6–8 | 613 | Public | 1.1 mi |
| Waterloo High SchoolWaterloo | 9–12 | 876 | Public | 0.5 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Gibault CatholicWaterloo | 9–12 | 192 | Roman Catholic | 1.6 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Paderborn and Floraville.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.