38 public K-12 schools in Ontario from NCES Common Core of Data: enrollment, grade span, demographics, and Civil Rights Data Collection statistics for every active campus.
National city placement
According to NCES CCD 2024-25, Ontario has more public-school enrollment than 95% of the 4,487 US cities in this directory. Ontario is among the largest city school systems in this directory by enrollment, but its campuses are divided among 5 districts. That combination matters: citywide averages blend separate budgets, staffing policies, attendance boundaries, and program rules. For a family comparing schools here, the district column is as important as the city average; two nearby campuses may answer to different boards and draw on different F-33 funding pools.
26 of Ontario's 38 listed schools are elementary campuses. That composition means citywide enrollment and staffing averages are influenced more by early-grade operating patterns than by the city's 6 middle and 6 high-school records. Families comparing later grades should rely on those individual rows rather than the all-school mean.
Ontario's reporting schools show 65.8% free-lunch eligibility across measured enrollment, alongside an average 21.2:1 student-teacher ratio. These are separate constraints: one describes the economic context of enrolled students and the other compares student and teacher headcounts. The 62-point gap between Online Academy and Park View Elementary is therefore more useful than the city mean alone. A school with a similar ratio may still report different counselor access, attendance, or gifted-program availability, so open the campus records before drawing conclusions about student support.
Ontario school enrollment ranges from 20 students (lowest) to 3,127 students (highest), a spread of 3,107 students. That ratio is an extreme outlier spread — among the widest gaps observed anywhere in this dataset. Per-school staffing and program breadth can differ sharply at opposite ends of that enrollment range, so the city average should not be treated as a typical campus.
Source: NCES Common Core of Data
The reported share sits between 62.5% and 75%, above a simple majority but below the highest descriptive band used here. Title I operates under the Every Student Succeeds Act (ESSA, 2015), but its statutory allocation uses additional LEA-level counts and rules not represented by this average. This percentage is an economic-need context measure; it does not establish a Title I award, show dollars received, or describe how funds are distributed among campuses.
Source: NCES Common Core of Data
Each school district has independent budgeting, hiring, and service delivery authority. The fragmentation reflects historical patterns of inter-municipal boundary lines that pre-date modern city growth, students in different parts of the same city can attend different districts with different per-pupil spending, calendars, and graduation requirements. Per-region variation is largest in fragmented systems because each school district sets its own budget, contracts, and priorities without higher-level coordination above the regulatory floor.
Source: NCES Common Core of Data
student-teacher ratio is the simplest comparative metric but it does not capture the full picture: the ratio counts FTE classroom teachers against total enrollment, push-in specialists, English-language aides, special-education co-teachers, and counselors are not included in most reporting Higher values may reflect larger urban scale or recent resource constraints that have widened the gap.
Ranked by the Simpson student-body diversity index (0-100) from NCES race and ethnicity data, where higher means a more evenly mixed student body. It measures mix, not quality.
Online Academy has the highest Resource Investment Index among the Ontario schools in this federal-data comparison at 62/100. The index summarizes reported staffing, counseling, gifted-program, and attendance inputs; it is not an academic rating.
Ontario has 38 public schools with a total enrollment of 25,478 students. Average student-teacher ratio: 21.2:1.
Side-by-side: Compare any two schools or districts in California →
Data from NCES Common Core of Data (CCD) 2024-25 and Civil Rights Data Collection (CRDC) 2021-22. The Resource Investment Index uses reported student-teacher ratio, counselor access, gifted programs, and attendance; it is not an academic rating. Cities must include at least five schools to be listed. This public-data comparison is for informational purposes: verify current enrollment, attendance boundaries, and programs with the school district before acting. See the guide to understanding NCES data.
