Top 100 largest schools in Illinois (2025)

Schools with the highest enrollment. Ordered by the measure shown, with the Success Index (US) for context; 100 schools shown.

#	School	Sector	Enrollment	Success Index (US)	Key result	Students
1	Adlai E Stevenson High School Lincolnshire · High · Grades 9–12	Public	4,758	75.9 Top 25%	76% Math proficiency	4,758
2	Lane Technical High School Chicago · High · Grades 7–12	Public	4,604	80.2 Top 10%	90% Math proficiency	4,604
3	Taft High School Chicago · High · Grades 7–12	Public	4,487	43.4 Lower 50%	39% Math proficiency	4,487
4	Waukegan High School Waukegan · High · Grades 9–12	Public	4,186	21.6 Lower 50%	10% Math proficiency	4,186
5	East High School Aurora · High · Grades 9–12	Public	4,020	16.7 Lower 50%	14% Math proficiency	4,020
6	Lyons Twp High Sch La Grange · High · Grades 9–12	Public	3,706	67.0 Top 25%	64% Math proficiency	3,706
7	Lockport Township High Sch East Lockport · High · Grades 9–12	Public	3,678	40.0 Lower 50%	40% Math proficiency	3,678
8	West Aurora High School Aurora · High · Grades 9–12	Public	3,641	26.4 Lower 50%	20% Math proficiency	3,641
9	Evanston Twp High School Evanston · High · Grades 9–12	Public	3,560	63.3 Top 50%	50% Math proficiency	3,560
10	Warren Township High School Gurnee · High · Grades 9–12	Public	3,537	46.3 Lower 50%	42% Math proficiency	3,537
11	Joliet West High School Joliet · High · Grades 9–12	Public	3,451	23.6 Lower 50%	23% Math proficiency	3,451
12	J Sterling Morton East High Sch Cicero · High · Grades 10–12	Public	3,394	10.1 Lower 50%	7% Math proficiency	3,394
13	J Sterling Morton West High Sch Berwyn · High · Grades 9–12	Public	3,374	16.3 Lower 50%	10% Math proficiency	3,374
14	Oak Park & River Forest High Sch Oak Park · High · Grades 9–12	Public	3,307	75.2 Top 25%	59% Math proficiency	3,307
15	Bolingbrook High School Bolingbrook · High · Grades 9–12	Public	3,298	36.9 Lower 50%	31% Math proficiency	3,298
16	Joliet Central High School Joliet · High · Grades 9–12	Public	3,295	15.1 Lower 50%	15% Math proficiency	3,295
17	Curie Metropolitan High School Chicago · High · Grades 9–12	Public	3,099	15.0 Lower 50%	14% Math proficiency	3,099
18	Neuqua Valley High School Naperville · High · Grades 9–12	Public	3,018	81.2 Top 10%	74% Math proficiency	3,018
19	Glenbrook South High School Glenview · High · Grades 9–12	Public	2,923	73.4 Top 25%	68% Math proficiency	2,923
20	Minooka Community High School Channahon · High · Grades 9–12	Public	2,918	36.4 Lower 50%	36% Math proficiency	2,918
21	Oswego High School Oswego · High · Grades 9–12	Public	2,870	52.1 Top 50%	42% Math proficiency	2,870
22	Waubonsie Valley High School Aurora · High · Grades 9–12	Public	2,849	65.1 Top 50%	52% Math proficiency	2,849
23	Carl Sandburg High School Orland Park · High · Grades 9–12	Public	2,840	49.5 Top 50%	46% Math proficiency	2,840
24	Huntley High School Huntley · High · Grades 9–12	Public	2,804	62.5 Top 50%	49% Math proficiency	2,804
25	New Trier Township H S Winnetka Winnetka · High · Grades 10–12	Public	2,770	86.6 Top 5%	80% Math proficiency	2,770
26	Metea Valley High School Aurora · High · Grades 9–12	Public	2,766	70.6 Top 25%	61% Math proficiency	2,766
27	Oswego East High School Oswego · High · Grades 9–12	Public	2,758	54.4 Top 50%	42% Math proficiency	2,758
28	Barrington High School Barrington · High · Grades 9–12	Public	2,718	66.8 Top 25%	67% Math proficiency	2,718
29	Homewood-Flossmoor High School Flossmoor · High · Grades 9–12	Public	2,707	39.8 Lower 50%	36% Math proficiency	2,707
30	Lincoln-Way East High School Frankfort · High · Grades 9–12	Public	2,696	58.0 Top 50%	58% Math proficiency	2,696
31	Wm Fremd High School Palatine · High · Grades 9–12	Public	2,689	71.6 Top 25%	71% Math proficiency	2,689
32	South Elgin High School South Elgin · High · Grades 9–12	Public	2,665	42.8 Lower 50%	32% Math proficiency	2,665
33	Niles West High School Skokie · High · Grades 9–12	Public	2,646	52.1 Top 50%	48% Math proficiency	2,646
34	J B Conant High School Hoffman Estates · High · Grades 9–12	Public	2,633	59.5 Top 50%	59% Math proficiency	2,633
35	Belleville High School-East Belleville · High · Grades 9–12	Public	2,600	34.3 Lower 50%	33% Math proficiency	2,600
36	Comm H S Dist 99 - South High Sch Downers Grove · High · Grades 9–12	Public	2,591	48.5 Lower 50%	48% Math proficiency	2,591
37	York Comm High School Elmhurst · High · Grades 9–12	Public	2,590	75.2 Top 25%	63% Math proficiency	2,590
38	Naperville Central High School Naperville · High · Grades 9–12	Public	2,589	78.3 Top 10%	70% Math proficiency	2,589
39	Elgin High School Elgin · High · Grades 9–12	Public	2,576	21.9 Lower 50%	22% Math proficiency	2,576
40	Dundee-Crown High School Carpentersville · High · Grades 9–12	Public	2,573	26.2 Lower 50%	27% Math proficiency	2,573
41	Amos Alonzo Stagg High School Palos Hills · High · Grades 9–12	Public	2,560	42.5 Lower 50%	42% Math proficiency	2,560
42	O Fallon High School O Fallon · High · Grades 9–12	Public	2,540	61.1 Top 50%	53% Math proficiency	2,540
43	Palatine High School Palatine · High · Grades 9–12	Public	2,535	41.0 Lower 50%	39% Math proficiency	2,535
44	Lake Park High School Roselle · High · Grades 9–12	Public	2,522	54.2 Top 50%	53% Math proficiency	2,522
45	Maine South High School Park Ridge · High · Grades 9–12	Public	2,494	65.3 Top 50%	65% Math proficiency	2,494
46	Naperville North High School Naperville · High · Grades 9–12	Public	2,467	78.1 Top 10%	66% Math proficiency	2,467
47	Hinsdale Central High School Hinsdale · High · Grades 9–12	Public	2,445	79.8 Top 10%	79% Math proficiency	2,445
48	Rich Township High School Olympia Fields · High · Grades 9–12	Public	2,433	27.9 Lower 50%	9% Math proficiency	2,433
49	Schaumburg High School Schaumburg · High · Grades 9–12	Public	2,416	54.1 Top 50%	53% Math proficiency	2,416
50	Plainfield North High School Plainfield · High · Grades 9–12	Public	2,399	61.3 Top 50%	54% Math proficiency	2,399
51	Edwardsville High School Edwardsville · High · Grades 9–12	Public	2,342	60.2 Top 50%	49% Math proficiency	2,342
52	Glenbard West High School Glen Ellyn · High · Grades 9–12	Public	2,330	61.1 Top 50%	54% Math proficiency	2,330
53	Plainfield South High School Plainfield · High · Grades 9–12	Public	2,323	42.8 Lower 50%	35% Math proficiency	2,323
54	Glenbard East High School Lombard · High · Grades 9–12	Public	2,311	37.7 Lower 50%	33% Math proficiency	2,311
55	Mundelein Cons High School Mundelein · High · Grades 9–12	Public	2,282	39.5 Lower 50%	39% Math proficiency	2,282
56	Kenwood Academy High School Chicago · High · Grades 7–12	Public	2,268	44.3 Lower 50%	47% Math proficiency	2,268
57	Yorkville High School Yorkville · High · Grades 9–12	Public	2,266	51.3 Top 50%	37% Math proficiency	2,266
58	Prospect High School Mt Prospect · High · Grades 9–12	Public	2,245	68.0 Top 25%	73% Math proficiency	2,245
59	Young Magnet High School Chicago · High · Grades 7–12	Public	2,223	81.5 Top 10%	93% Math proficiency	2,223
60	Guilford High School Rockford · High · Grades 9–12	Public	2,216	21.8 Lower 50%	20% Math proficiency	2,216
61	Lincoln Park High School Chicago · High · Grades 9–12	Public	2,214	55.1 Top 50%	52% Math proficiency	2,214
62	McHenry Community High School Mchenry · High · Grades 9–12	Public	2,214	60.9 Top 50%	37.7% Free/reduced-price lunch	2,214
63	Victor J Andrew High School Orland Hills · High · Grades 9–12	Public	2,213	42.2 Lower 50%	39% Math proficiency	2,213
64	Moline Sr High School Moline · High · Grades 9–12	Public	2,195	24.7 Lower 50%	22% Math proficiency	2,195
65	Round Lake Senior High School Round Lake · High · Grades 9–12	Public	2,194	16.7 Lower 50%	11% Math proficiency	2,194
66	Hoffman Estates High School Hoffman Estates · High · Grades 9–12	Public	2,185	45.8 Lower 50%	45% Math proficiency	2,185
67	Larkin High School Elgin · High · Grades 9–12	Public	2,174	19.7 Lower 50%	12% Math proficiency	2,174
68	Jefferson High School Rockford · High · Grades 9–12	Public	2,173	14.3 Lower 50%	11% Math proficiency	2,173
69	DeKalb High School Dekalb · High · Grades 9–12	Public	2,134	33.4 Lower 50%	29% Math proficiency	2,134
70	Belleville High School-West Belleville · High · Grades 9–12	Public	2,118	29.5 Lower 50%	27% Math proficiency	2,118
71	Zion-Benton Twnshp Hi Sch Zion · High · Grades 9–12	Public	2,114	22.1 Lower 50%	15% Math proficiency	2,114
72	Glenbrook North High School Northbrook · High · Grades 9–12	Public	2,111	78.2 Top 10%	74% Math proficiency	2,111
73	Comm H S Dist 99 - North H S Downers Grove · High · Grades 9–12	Public	2,082	63.8 Top 50%	62% Math proficiency	2,082
74	Glenbard North High School Carol Stream · High · Grades 9–12	Public	2,079	45.4 Lower 50%	38% Math proficiency	2,079
75	Normal Community High School Normal · High · Grades 9–12	Public	2,079	57.4 Top 50%	49% Math proficiency	2,079
76	Harry D Jacobs High School Algonquin · High · Grades 9–12	Public	2,056	52.3 Top 50%	47% Math proficiency	2,056
77	Lincoln Way West New Lenox · High · Grades 9–12	Public	2,047	55.8 Top 50%	58% Math proficiency	2,047
78	Hampshire High School Hampshire · High · Grades 9–12	Public	2,046	57.2 Top 50%	50% Math proficiency	2,046
79	John Hersey High School Arlington Heights · High · Grades 9–12	Public	2,040	66.3 Top 25%	65% Math proficiency	2,040
80	West Chicago Comm High School West Chicago · High · Grades 9–12	Public	2,040	28.8 Lower 50%	28% Math proficiency	2,040
81	Bartlett High School Bartlett · High · Grades 9–12	Public	2,037	50.0 Top 50%	39% Math proficiency	2,037
82	Buffalo Grove High School Buffalo Grove · High · Grades 9–12	Public	2,021	55.0 Top 50%	62% Math proficiency	2,021
83	Niles North High School Skokie · High · Grades 9–12	Public	1,999	54.8 Top 50%	45% Math proficiency	1,999
84	Lincoln-Way Central High School New Lenox · High · Grades 9–12	Public	1,991	61.6 Top 50%	56% Math proficiency	1,991
85	Willowbrook High School Villa Park · High · Grades 9–12	Public	1,983	43.0 Lower 50%	39% Math proficiency	1,983
86	Auburn High School Rockford · High · Grades 9–12	Public	1,957	27.5 Lower 50%	29% Math proficiency	1,957
87	Rolling Meadows High School Rolling Meadows · High · Grades 9–12	Public	1,956	48.7 Lower 50%	50% Math proficiency	1,956
88	Collinsville High School Collinsville · High · Grades 9–12	Public	1,956	25.5 Lower 50%	21% Math proficiency	1,956
89	Jones College Prep High School Chicago · High · Grades 9–12	Public	1,954	80.6 Top 10%	92% Math proficiency	1,954
90	Reavis High School Burbank · High · Grades 9–12	Public	1,930	22.4 Lower 50%	21% Math proficiency	1,930
91	St Charles East High School Saint Charles · High · Grades 9–12	Public	1,930	57.0 Top 50%	51% Math proficiency	1,930
92	Maine East High School Park Ridge · High · Grades 9–12	Public	1,921	36.6 Lower 50%	34% Math proficiency	1,921
93	Unity Jr High School Cicero · Middle · Grades 7–8	Public	1,919	18.3 Lower 50%	11% Math proficiency	1,919
94	A B Shepard High Sch (Campus) Palos Heights · High · Grades 9–12	Public	1,916	28.9 Lower 50%	26% Math proficiency	1,916
95	Bradley-Bourbonnais C High School Bradley · High · Grades 9–12	Public	1,914	30.1 Lower 50%	21% Math proficiency	1,914
96	Elk Grove High School Elk Grove Village · High · Grades 9–12	Public	1,906	38.3 Lower 50%	38% Math proficiency	1,906
97	St Charles North High School Saint Charles · High · Grades 9–12	Public	1,903	64.5 Top 50%	66% Math proficiency	1,903
98	Streamwood High School Streamwood · High · Grades 9–12	Public	1,890	23.0 Lower 50%	15% Math proficiency	1,890
99	Harlem High School Machesney Park · High · Grades 9–12	Public	1,884	32.9 Lower 50%	27% Math proficiency	1,884
100	Proviso West High School Hillside · High · Grades 9–12	Public	1,870	18.4 Lower 50%	4% Math proficiency	1,870

Adlai E Stevenson High School in Lincolnshire leads the 2025 list of largest schools in Illinois with Enrollment 4,758. Of the 100 schools shown, 100 are public.

Use the rankings to build a shortlist, then visit the schools and ask how they support students at your child's level.

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Frequently asked questions

What is the best largest school in Illinois?

Adlai E Stevenson High School in Lincolnshire ranks first among largest schools in Illinois with Enrollment 4,758 (Enrollment: 4,758).

How are largest schools in Illinois ranked?

Schools with the highest enrollment. Only schools eligible for the Success Index (US) are included; the index is shown alongside for context.

Are these 2025 rankings official?

No. They are computed by Success Tutoring from official American data (Urban Institute Education Data Portal (NCES CCD, EDFacts); NCES Common Core of Data). States set their own assessments and proficiency cut scores, so proficiency rates are most comparable within a state. Use the state rankings for like-for-like comparisons.