Mary C O'Brien Elementary School

Located at 1400 N ELEVEN MILE CORNER RD, in CASA GRANDE, Arizona, Mary C O'Brien Elementary School is a very small elementary school that works with 123 students (grades K through 6), part of Mary C O'Brien Accommodation District (4435). By comparison, Arizona's public schools average about 451 students each, so Mary C O'Brien Elementary School sits 73% leaner than that benchmark.

Within Mary C O'Brien Accommodation District (4435), which oversees 2 schools and 198 students, Mary C O'Brien Elementary School is one campus in the system.

On demographics, Mary C O'Brien Elementary School records that 53% of students identify as Hispanic, with the remaining enrollment distributed across several groups. Beyond that, the school reports 37% White, 7% multiracial, 2% Native American. That is meaningfully more Hispanic than the county at large, where the share is closer to 30%.

On the income-and-resources front, Mary C O'Brien Elementary School reports 13 full-time-equivalent teachers, putting the student-to-teacher ratio at about 9.8:1. The state averages around 17.0:1, so this campus is tighter than the state norm typical.

Around the school, the surrounding county (Pinal County) records that the typical household earns roughly $80,266 per year, about 23% of the adult population holds a bachelor's degree or above, and roughly 8% of residents live below the federal poverty line. Across Pinal County's 155 public schools (combined enrollment of about 63,837 students), Mary C O'Brien Elementary School is one campus in the mix.

Nearest neighbor: CAVIT - Central Arizona Valley Institute of Technology, around 5.7 miles off. 8 of the 8 nearest public schools sit inside a ten-mile radius, suggesting a relatively low-density school footprint.

The school occupies a low-density site.

Over the past 7-year window. Looking back 7 years, enrollment at Mary C O'Brien Elementary School has ticked up 9%, going from 113 students in 2018 to 123 in 2025. Over the same period, the Hispanic share declined from 59% to 53%. The student-to-teacher ratio tightened from 11.3:1 in 2018 to 9.8:1 today.

Within the allk12 community for this school, posts here usually surface around open house dates, ride-share offers, and field-trip permission slips. Contributors range from current parents to recent graduates and teachers.