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Advertise here →St. Clair County · Illinois
St. Clair County, Illinois real estate & cities.
Countywide real estate hub for St. Clair County, IL — 16 live city guides, public market snapshots, and connections to local professionals.
St. Clair County, Illinois is a county-level market on USAHouses.com — a countywide hub linking verified city guides, public market data, and ways to connect with licensed professionals. We currently publish 16 city-level guides inside St. Clair County, covering resale homes, condos, land, and new construction across the county.
County pages complement city guides: they group places by official Census county or county-equivalent boundaries, surface nearby counties and major Illinois cities, and link to NewUSAHouses.com builder hubs when available.
St. Clair County corresponds to Census FIPS code 17163. FIPS is the geographic code for USA Counties.
County snapshot
St. Clair County at a glance
City guides on USAHouses
16 live
Combined population (catalogued places)
195,086
Median household income (midpoint of places)
$84,464
Median home value range (Census ACS)
$52,700 – $276,900
County median listing price
$204,475 (2026-06-01)
County price trend (FHFA HPI)
+5.3% (2025)
Market data compiled from public sources on linked city guides and county-level datasets; deemed reliable but not guaranteed. Full source list ↗
Places in St. Clair County
Cities & towns in St. Clair County
St. Clair County includes 16 places USAHouses.com tracks in its city manifest; 16 already have live market guides linked below.
Belleville
Pop. 41,722 · Market guide
O'Fallon
Pop. 32,139 · Market guide
East St. Louis
Pop. 18,278 · Market guide
Cahokia Heights
Pop. 17,173 · Market guide
Fairview Heights
Pop. 16,255 · Market guide
Swansea
Pop. 14,603 · Market guide
Shiloh
Pop. 14,109 · Market guide
Mascoutah
Pop. 8,743 · Market guide
Lebanon
Pop. 4,431 · Market guide
Freeburg
Pop. 4,336 · Market guide
Scott AFB
Pop. 4,195 · Market guide
Caseyville
Pop. 4,170 · Market guide
Millstadt
Pop. 4,013 · Market guide
Dupo
Pop. 3,914 · Market guide
Smithton
Pop. 3,512 · Market guide
New Baden
Pop. 3,493 · Market guide
Nearby
Nearby counties & major cities in Illinois
Other counties in Illinois with USAHouses city or county coverage:
Cook County
95 catalogued places
Lake County
31 catalogued places
DuPage County
29 catalogued places
Will County
20 catalogued places
McHenry County
17 catalogued places
Kane County
14 catalogued places
Madison County
11 catalogued places
Champaign County
7 catalogued places
Larger Illinois cities with live USAHouses market guides — populous places first, including major metro hubs when available:
Chicago
Major metro
Aurora
Pop. 179,867 · Major metro city
Joliet
Pop. 149,785 · Major metro city
Naperville
Pop. 149,424 · Major metro city
Rockford
Pop. 147,649 · Major metro city
Elgin
Pop. 114,106 · Major city
Springfield
Pop. 113,714 · Major city
Peoria
Pop. 112,126 · Major city
Major metro hubs serving buyers comparing St. Clair County with larger nearby markets:
New construction
New homes in & near St. Clair County
Verified new-construction communities on NewUSAHouses.com in Illinois — linked when a matching metro or state hub exists.
Local resources
Get help buying or selling in St. Clair County
What can I afford?
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Rough estimate only (28% of income toward housing, ~6.5% illustrative rate, 30-year term) — not a loan offer or pre-qualification. Connect with a lender for real numbers →
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Official resources
St. Clair County government & services
St. Clair County government
Official county or county-equivalent government website (source: public records / Wikidata). Official site ↗
Schools
East St Louis SD 189 — 12 schools, 4,679 students (largest district in county by enrollment; attendance zones vary by address).
County median listing price
$204,475 as of 2026-06-01 (FRED / Realtor.com county median listing price).
County house price trend
FHFA all-transactions HPI annual change +5.3% (2025).
Common questions
St. Clair County FAQ
What cities and towns are in St. Clair County, IL?
USAHouses.com currently catalogues 16 places in St. Clair County, with live market guides for 16 of them. Census recognizes additional small places and CDPs in most counties that may not yet have dedicated pages.
Where should I start looking for homes in St. Clair County?
Start with the live city guides for Belleville, O'Fallon, East St. Louis, Cahokia Heights, Fairview Heights, and 11 more — each links Census market data, nearby places, and ways to connect with local professionals.
Does USAHouses.com cover new construction in St. Clair County?
City and county guides link to NewUSAHouses.com where verified new-home communities exist in Illinois. Use the new-construction section on this page for same-state builder hubs; availability varies by market.
How is the St. Clair County housing market trending?
County-level FHFA house price index data shows a +5.3% annual change in 2025 — a countywide benchmark, not a guarantee for any single city or street.
How do I connect with an agent in St. Clair County?
Use the lead form at the bottom of this page to describe your buy or sell goals in St. Clair County. USA HOUSES LLC is a platform/media company, not a brokerage; licensed professionals are disclosed separately.
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