Illinois · NCES CCD 2024-25
Largest Schools in Illinois The 50 largest public schools in Illinois, ranked by total student enrollment from NCES CCD 2024-25.
Compiled from official source data by PlainSchools . · Updated August 2026
4,758 Largest school
3,020 Avg across top 50
50 Schools listed The ranking in one line
Adlai E Stevenson High School in Lincolnshire is Illinois's largest public school with 4,758 students enrolled.
4,758 students at Adlai E Stevenson High School
18.9:1 student-teacher ratio at the largest school
3,020 average across the top 50 # School Student:Teacher Level District Enrollment 1 Adlai E Stevenson High School Lincolnshire 18.9:1 High Adlai E Stevenson HSD 125 4,758 2 Lane Technical High School Chicago 17.8:1 Other City of Chicago SD 299 4,604 3 Taft High School Chicago 16.7:1 Other City of Chicago SD 299 4,487 4 Waukegan High School Waukegan 16.6:1 High Waukegan CUSD 60 4,186 5 East High School Aurora 18.6:1 High Aurora East USD 131 4,020 6 Lyons Twp High Sch La Grange 14.5:1 High Lyons Twp HSD 204 3,706 7 Lockport Township High Sch East Lockport 16.3:1 High Lockport Twp HSD 205 3,678 8 West Aurora High School Aurora 14.9:1 High Aurora West USD 129 3,641 9 Evanston Twp High School Evanston 13.2:1 High Evanston Twp HSD 202 3,560 10 Warren Township High School Gurnee 16.4:1 High Warren Twp HSD 121 3,537 11 Joliet West High School Joliet 20.5:1 High Joliet Twp HSD 204 3,451 12 J Sterling Morton East High Sch Cicero 20.1:1 High J S Morton HSD 201 3,394 13 J Sterling Morton West High Sch Berwyn 16.4:1 High J S Morton HSD 201 3,374 14 Oak Park & River Forest High Sch Oak Park 14.1:1 High Oak Park - River Forest SD 200 3,307 15 Bolingbrook High School Bolingbrook 14.3:1 High Valley View CUSD 365U 3,298 16 Joliet Central High School Joliet 17.9:1 High Joliet Twp HSD 204 3,295 17 Curie Metropolitan High School Chicago 16.1:1 High City of Chicago SD 299 3,099 18 Neuqua Valley High School Naperville 14.2:1 High Indian Prairie CUSD 204 3,018 19 Glenbrook South High School Glenview 13.2:1 High Glenbrook HSD 225 2,923 20 Minooka Community High School Minooka 17.9:1 High Minooka CHSD 111 2,918 21 Oswego High School Oswego 16.1:1 High CUSD 308 2,870 22 Waubonsie Valley High School Aurora 16.7:1 High Indian Prairie CUSD 204 2,849 23 Carl Sandburg High School Orland Park 15.8:1 High Cons HSD 230 2,840 24 Huntley High School Huntley 15.6:1 High Huntley Comm Sch Dist 158 2,804 25 New Trier Township H S Winnetka Winnetka 11:1 High New Trier Twp HSD 203 2,770 26 Metea Valley High School Aurora 14.5:1 High Indian Prairie CUSD 204 2,766 27 Oswego East High School Oswego 16.2:1 High CUSD 308 2,758 28 Barrington High School Barrington 16:1 High Barrington CUSD 220 2,718 29 Homewood-Flossmoor High School Flossmoor 13.5:1 High Homewood Flossmoor CHSD 233 2,707 30 Lincoln-Way East High School Frankfort 18.7:1 High Lincoln Way CHSD 210 2,696 31 Wm Fremd High School Palatine 16.7:1 High Township HSD 211 2,689 32 South Elgin High School South Elgin 15.5:1 High SD U-46 2,665 33 Niles West High School Skokie 14.4:1 High Niles Twp HSD 219 2,646 34 J B Conant High School Hoffman Estates 17.3:1 High Township HSD 211 2,633 35 Belleville High School-East Belleville 16.9:1 High Belleville Twp HSD 201 2,600 36 Comm H S Dist 99 - South High Sch Downers Grove 14.5:1 High CHSD 99 2,591 37 York Comm High School Elmhurst 14.6:1 High Elmhurst SD 205 2,590 38 Naperville Central High School Naperville 14.6:1 High Naperville CUSD 203 2,589 39 Elgin High School Elgin 16.8:1 High SD U-46 2,576 40 Dundee-Crown High School Carpentersville 15.5:1 High CUSD 300 2,573 41 Amos Alonzo Stagg High School Palos Hills 14.5:1 High Cons HSD 230 2,560 42 O Fallon High School O Fallon 17:1 High O Fallon Twp HSD 203 2,540 43 Palatine High School Palatine 13.6:1 High Township HSD 211 2,535 44 Lake Park High School Roselle 14.9:1 High Lake Park CHSD 108 2,522 45 Maine South High School Park Ridge 17.3:1 High Maine Township HSD 207 2,494 46 Naperville North High School Naperville 13.5:1 High Naperville CUSD 203 2,467 47 Hinsdale Central High School Hinsdale 14.1:1 High Hinsdale Twp HSD 86 2,445 48 Rich Township High School Olympia Fields 12.1:1 High Rich Twp HSD 227 2,433 49 Schaumburg High School Schaumburg 16.7:1 High Township HSD 211 2,416 50 Plainfield North High School Plainfield 18:1 High Plainfield SD 202 2,399
Explore More for Illinois Methodology
Enrollment data comes from the NCES Common Core of Data (CCD) 2024-25 school year.
Schools are ranked by total student enrollment. Student-teacher ratios are calculated
from full-time equivalent (FTE) teacher counts reported by each school.
Read our methodology
- how this data is sourced, computed, and verified.