Northbrook School

As a reasonably sized middle school in Mendota, Illinois, Northbrook School enrolls 526 students from grades 5 through 8, one of the schools within Mendota CCSD 289.

Mendota CCSD 289 comprises 3 schools with combined enrollment of 1,042 students; Northbrook School is among them.

On the student-mix side, Northbrook School shows that the most-represented group is White (54%), with the rest of the student body spread across multiple groups. The remainder reads as 40% Hispanic, 3% multiracial, 2% Black. By comparison, LaSalle County as a whole is about 86% White, so the school skews noticeably less White than its surroundings.

On the resource side, On paper, Northbrook School has 38 full-time-equivalent teachers, translating to a class-load average of around 13.8:1. Statewide, the average ratio sits near 13.0:1, putting Northbrook School higher than the state norm the norm. An estimated 59% of students are eligible for free or reduced-price lunch, a number frequently used as a low-income enrollment indicator.

On a residual basis (actual vs predicted given the student mix), Northbrook School sits in the middle band of the BeatsExpectations distribution. Schools with this campus's student mix typically land near 37.7%; this one delivers 40.1%.

In the broader community, community-level numbers for LaSalle County indicate median household income runs about $73,045, roughly 21% of adults have completed at least a four-year degree, and census figures put the poverty rate at about 11%. In all, LaSalle County runs 54 public schools (combined enrollment of about 14,523 students), of which Northbrook School is one.

The closest other public school is Lincoln Elem School, roughly 0.8 miles away. Within five miles, there are 3 other public schools. Among the 7 schools in that immediate cluster with test data (this one included), Northbrook School ranks 2nd on composite proficiency, above the local average of 31.9%.

The school occupies a town-based site.

Over the past 7-year window. Over the past 7-year window, the student count contracted 7%: 563 students in 2018 compared to 526 in 2025. The student-to-teacher ratio fell from 16.6:1 in 2018 to 13.8:1 today.

On this page, the feed for Northbrook School typically covers classroom updates, athletics, and weather closures. The community welcomes input from current and former families.