Largest Schools in Ontario-Montclair (2025)

Schools with the highest enrollment. Ranked by the Success Index (US) from official American data; 32 schools in Ontario-Montclair, California. Rank positions shown on each profile are within United States and California.

#	School	Sector	Enrollment	Success Index (US)	Key result	Students
1	Edison Elementary Ontario · Elementary · Grades K–8	Public	736	54.8 Top 50%	60% Math proficiency	736
2	Central Language Academy Ontario · Elementary · Grades K–8	Public	736	31.8 Lower 50%	27% Math proficiency	736
3	Ray Wiltsey Middle Ontario · Middle · Grades 6–8	Public	727	20.0 Lower 50%	25% Math proficiency	727
4	Oaks Middle Ontario · Middle · Grades 7–8	Public	668	28.8 Lower 50%	31% Math proficiency	668
5	Serrano Middle Montclair · Middle · Grades 7–8	Public	657	40.0 Lower 50%	48% Math proficiency	657
6	Richard Haynes Elementary Ontario · Elementary · Grades K–6	Public	641	24.9 Lower 50%	34% Math proficiency	641
7	Berlyn Elementary Ontario · Elementary · Grades K–6	Public	639	13.4 Lower 50%	22% Math proficiency	639
8	Bon View Elementary Ontario · Elementary · Grades K–6	Public	598	18.4 Lower 50%	27% Math proficiency	598
9	Sultana Elementary Ontario · Elementary · Grades K–6	Public	589	33.7 Lower 50%	41% Math proficiency	589
10	Vernon Middle Montclair · Middle · Grades 7–8	Public	580	26.9 Lower 50%	29% Math proficiency	580
11	Euclid Elementary Ontario · Elementary · Grades K–6	Public	572	25.3 Lower 50%	35% Math proficiency	572
12	Mission Elementary Ontario · Elementary · Grades K–6	Public	571	25.7 Lower 50%	37% Math proficiency	571
13	Montera Elementary Montclair · Elementary · Grades K–6	Public	564	22.8 Lower 50%	30% Math proficiency	564
14	Vineyard Elementary Ontario · Elementary · Grades K–8	Public	562	29.9 Lower 50%	36% Math proficiency	562
15	Ramona Elementary Montclair · Elementary · Grades K–6	Public	556	34.8 Lower 50%	42% Math proficiency	556
16	Hawthorne Elementary Ontario · Elementary · Grades K–6	Public	549	22.9 Lower 50%	29% Math proficiency	549
17	Elderberry Elementary Ontario · Elementary · Grades K–6	Public	544	37.7 Lower 50%	52% Math proficiency	544
18	Vina Danks Middle Ontario · Middle · Grades 7–8	Public	544	23.3 Lower 50%	23% Math proficiency	544
19	Mariposa Elementary Ontario · Elementary · Grades K–6	Public	537	15.4 Lower 50%	24% Math proficiency	537
20	Monte Vista Elementary Montclair · Elementary · Grades K–6	Public	535	38.8 Lower 50%	47% Math proficiency	535
21	Lincoln Elementary Ontario · Elementary · Grades K–6	Public	530	26.3 Lower 50%	37% Math proficiency	530
22	De Anza Middle Ontario · Middle · Grades 7–8	Public	510	22.0 Lower 50%	26% Math proficiency	510
23	Kingsley Elementary Montclair · Elementary · Grades K–6	Public	494	26.3 Lower 50%	37% Math proficiency	494
24	Arroyo Elementary Ontario · Elementary · Grades K–8	Public	493	23.1 Lower 50%	29% Math proficiency	493
25	Lehigh Elementary Montclair · Elementary · Grades K–6	Public	477	26.2 Lower 50%	42% Math proficiency	477
26	El Camino Elementary Ontario · Elementary · Grades K–6	Public	476	21.0 Lower 50%	29% Math proficiency	476
27	Howard Elementary Montclair · Elementary · Grades K–6	Public	433	37.2 Lower 50%	46% Math proficiency	433
28	Moreno Elementary Montclair · Elementary · Grades K–6	Public	428	40.2 Lower 50%	46% Math proficiency	428
29	Del Norte Elementary Ontario · Elementary · Grades K–6	Public	428	21.2 Lower 50%	30% Math proficiency	428
30	Corona Elementary Ontario · Elementary · Grades K–6	Public	414	25.9 Lower 50%	38% Math proficiency	414
31	Buena Vista Arts-Integrated Montclair · Elementary · Grades K–6	Public	369	44.3 Lower 50%	49% Math proficiency	369
32	Vista Grande Elementary Ontario · Elementary · Grades K–6	Public	358	42.6 Lower 50%	49% Math proficiency	358

Edison Elementary in Ontario leads the 2025 list of largest schools in Ontario-Montclair with Enrollment 736. Of the 32 schools shown, 32 are public.

For the full picture see the wider California largest schools rankings, every school on the Ontario-Montclair page, or the comparison tool to put a shortlist side by side.

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Frequently asked questions

What is the best largest school in Ontario-Montclair?

Edison Elementary in Ontario, California ranks first among largest schools in Ontario-Montclair with Enrollment 736 (Enrollment: 736).

How are largest schools in Ontario-Montclair 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.