allk12 · Rankings · Largest · Illinois · St. Clair County · High schools

The largest public high schools in St. Clair County, Illinois

This ranking covers the largest public high schools in St. Clair County, Illinois, drawn from 14 qualifying public high schools. Belleville High School-East leads the list at 2,600, against a median of 770 across the ranked schools.

Use the search box to find a specific school within this ranking, sort by any column, or export the full list. Built from NCES and state data for 2024-25.

Schools ranked

St. Clair County, Illinois

Top Students

2,600

Median Students

770

LARGEST · ST. CLAIR COUNTY, ILLINOIS

#	School	City	District	Level	Students
1	Belleville High School-East	Belleville, IL	Belleville Twp HSD 201	High	2,600
2	O Fallon High School	O Fallon, IL	O Fallon Twp HSD 203	High	2,540
3	Belleville High School-West	Belleville, IL	Belleville Twp HSD 201	High	2,118
4	Collinsville High School	Collinsville, IL	Collinsville CUSD 10	High	1,956
5	East St Louis Senior High School	East Saint Louis, IL	East St Louis SD 189	High	1,288
6	Mascoutah High School	Mascoutah, IL	Mascoutah CUD 19	High	1,243
7	Cahokia High School	Cahokia, IL	Cahokia CUSD 187	High	850
8	Freeburg Community High Sch	Freeburg, IL	Freeburg CHSD 77	High	689
9	Dupo High School	Dupo, IL	Comm Unit School District No 196	High	259
10	Marissa Jr & Sr High School	Marissa, IL	Marissa CUSD 40	High	226
11	Lebanon High School	Lebanon, IL	Lebanon CUSD 9	High	218
12	New Athens High School	New Athens, IL	New Athens CUSD 60	High	164
13	SIU Charter Sch of East St Louis	East Saint Louis, IL	East St Louis SD 189	High	99
14	Lovejoy Technology Academy	Lovejoy, IL	Brooklyn UD 188	High	27

Page 1 of 1 · top 14 of 14 ranked. NCES + state assessment data, 2024-25.↓ Download full CSV

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DATA NOTICE

allk12 is independent and not affiliated with, endorsed by, or sponsored by NCES, the US Census Bureau, any state education agency or assessment program, or any other government agency. Source data is compiled from public records and provided "as is," without warranty of accuracy or completeness. You rely on it, and any analysis derived from it, at your own risk. See the full disclaimer.