Waterloo is the seat of Monroe County and the largest community in it, far enough south of the Mississippi River bluffs to feel like its own town rather than a St. Louis suburb, and close enough that the commute still works.
About Waterloo, Illinois
Waterloo has a population of about 11,129 and roughly 4,818 housing units. It is 78.2% owner-occupied, and the median home value is $249,500. The median year built is 1991, which puts its housing stock newer than most of the older Metro East river towns and older than the newest subdivisions in St. Clair County.
Source: U.S. Census Bureau, American Community Survey 5-year estimates (B01003, B25001, B25003, B25035, B25077).
Waterloo IL Real Estate Market Overview
Waterloo is an active market for a town its size.
- 220 homes closed in Waterloo between October 2025 and September 2026
- Median home value across all owner-occupied homes is $249,500
- 78.2% of occupied homes are owner-occupied, so most of what trades here is primary-residence stock rather than rentals
Source: MARIS MLS closed residential sales, October 1 2025 through September 25 2026, pulled September 25 2026. Census figures as above.
Buying a Home in Waterloo, IL
What to weigh before you make an offer in Waterloo:
- Monroe County, not St. Clair. Different county, different tax bill and different school district. Do not assume a St. Clair County comparison carries over.
- Commute discipline. Waterloo runs on Route 3 and Route 156 with I-255 as the link north. Drive your actual commute at your actual departure time before you commit.
- Newer stock, but check the year. A 1991 median means the range runs from genuinely new construction to homes now past thirty years old and due for roof, HVAC and windows.
- Low rental share. At 78.2% owner-occupancy, inventory is thinner than in a rental-heavy market, and well-priced homes move.
Selling Your Home in Waterloo, IL
220 closings in twelve months means there is real buyer traffic here, but it also means your home is being compared against a steady supply of alternatives. Pricing against genuine Waterloo comparables, not Columbia or Belleville ones, is what decides how long you sit.
Schools in Waterloo, IL
Waterloo is served by Waterloo Community Unit School District 5. School assignment follows the address, so confirm the attendance boundary for any specific home before you write an offer.
Commuting from Waterloo
Waterloo sits south of Columbia on the Route 3 corridor, with I-255 carrying traffic north toward downtown St. Louis and east toward the rest of the Metro East. Commute times vary widely by destination and departure time.
Waterloo IL Real Estate: Common Questions
How many homes sell in Waterloo each year?
220 homes closed between October 2025 and September 2026 according to MARIS MLS.
What is a typical home worth in Waterloo?
The Census puts the median value of an owner-occupied home at $249,500.
Is Waterloo mostly owner-occupied?
Yes. 78.2% of occupied homes are owner-occupied.
What county is Waterloo in?
Monroe County, Illinois. Waterloo is the county seat.
Work With Single Tree Team in Waterloo
Craig Ziegel has been licensed since 2011 and works across the Metro East and St. Louis. If you are buying or selling in Waterloo, get in touch and we will talk through what your specific block is doing.
What Waterloo Clients Say
Craig Ziegel holds a 5.0 rating from 111 Google reviews. Here are reviews from clients he worked with right here in Waterloo. See every review on Google.
★★★★★
“Craig was patient and very knowledgeable. I would highly recommend.”
Calvin Bailey · Waterloo, IL · Google review
★★★★★
“Craig worked with us through every step of the process and was a wealth of knowledge. Our transactions (both buying and selling) were complicated and challenging to say the least. Craig was an invaluable asset and mediator between parties, ultimately saving us a lot of money. He and his team helped us secure an amazing price on the home we were selling and negotiated our dream home. I highly recommend him and his team! reply Reply”
Haley Berghoefer · Waterloo, IL · Google review
Rated 4.8 out of 5 from 50 reviews on Zillow. Here is what clients in Waterloo said. Read every review on Zillow.
★★★★★
“I really enjoyed working with Craig when I bought a home in Illinois. Besides being friendly, personable and professional, he was a great negotiator! He saw to all the details and got me the house I wanted, for a great price!”
Zillow reviewer · Bought a home in Waterloo, IL · 2014 · Zillow review
★★★★★
“My experience with Craig was very pleasant. Being a first-time home buyer, he was very informative of the process and was always willing to answer questions anytime I had them. He was very honest and upfront to the best of his knowledge. I would definetly recommend Craig Ziegel to anyone looking for home.”
Eric · Bought a home in Waterloo, IL · 2017 · Zillow review
Want this kind of experience in Waterloo?
Talk to Craig directly. No pressure, no obligation, and a straight answer on what your Waterloo move actually looks like.
