Mariposa Elementary

Set in Ontario, California, Mariposa Elementary is a moderately sized K-5 school, overseen by Ontario-Montclair. It enrolls 537 students across grades K through 6.

Ontario-Montclair runs 33 schools in total, collectively educating 17,640 students. Mariposa Elementary is one of those campuses.

In terms of who attends, Mariposa Elementary shows that 86% of students identify as Hispanic, making the school strongly Hispanic-majority. Beyond that, the school records 10% Black, 2% White. The wider county runs roughly 55% Hispanic, putting the school's mix visibly more Hispanic than the area baseline.

On the resource side, Staff filings list 25 full-time-equivalent teachers, which works out to roughly 21.5:1 students per teacher. Statewide, the average ratio sits near 22.3:1, putting Mariposa Elementary tighter than the state norm the norm. An estimated 95% of students are eligible for free or reduced-price lunch, which schools and policymakers use as a rough income-mix signal. Set against San Bernardino County (around 74%), the school's rate is north of typical.

After controlling for student poverty, Mariposa Elementary tracks the demographic baseline. The model predicts 23.0% given the school's FRL share; actual proficiency is 31.1%.

Around the school, ACS estimates for San Bernardino County put the typical household earns roughly $85,478 per year, about 23% of the adult population holds a bachelor's degree or above, and census figures put the poverty rate at about 11%. Mariposa Elementary is one of 583 public schools in San Bernardino County (combined enrollment of about 393,648 students).

Ray Wiltsey Middle is the nearest neighboring public school, about 0.2 miles from this campus. 8 of the 8 nearest public schools sit inside a five-mile radius. Among the 7 schools in that immediate cluster with test data (this one included), Mariposa Elementary ranks 4th on composite proficiency, below the local average of 31.5%.

Geographically, the school is in a city-core area.

Looking at the recent track record. Over the past 7-year window, the student count edged down 16%: 641 students in 2018 compared to 537 in 2025. The student-to-teacher ratio tightened from 24.6:1 in 2018 to 21.5:1 today.

Within the allk12 community for this school, recent activity here tends to focus on enrollment questions, classroom assignments, and PTA news. Parents, students, alumni, and staff are welcome to weigh in.