Total enrollment
25,478
-903 (-3%) vs SY 2020-21
40 schools in Ontario
California · Public K-12
Ontario's public schools, 40 in all, serve about 25,478 K-12 students inside California, averaging 637 per school.
4-year change in Ontario
SY 2020-21 vs SY 2024-25School count
38
+2 (+6%) vs SY 2020-21
Source: NCES Common Core of Data, enrollment-weighted demographic averages
Residents
180,547
all ages · ACS 5-yr
Students
25,478
public K-12 · NCES
Schools
40
public K-12
About Ontario
Ontario is a high-population California city in terms of public-school footprint, with 40 schools and 25,478 students total.
In terms of grade levels, the city is built around 27 elementary, 6 middle, and 7 high.
Average school size in Ontario is around 637 students, 10% above the California average of about 578.
Trend over the past 4 years. Across the same 4-year window, public-school enrollment decreased 3%: 26,381 students in SY 2020-21 versus 25,478 in SY 2024-25. Over that span, Ontario added 2 schools, going from 36 to 38.
On this page, the community for Ontario discusses sports rivalries, cross-district programs, and shared facilities. Discussions cut across districts, schools, and grade levels.