Belvidere South Middle School

Belvidere South Middle School, a high-enrollment junior high in Belvidere, Illinois, run under Belvidere CUSD 100, enrolls 754 students, covering grades 6 through 8. That puts it 63% bigger than the typical public school in Illinois, which averages around 462 students.

Across the 10 schools in Belvidere CUSD 100 (7,523 students total), Belvidere South Middle School accounts for its share of the district's footprint.

On demographics, Belvidere South Middle School reports that the largest single group is Hispanic, at 58% of enrollment. Beyond that, the school lists 34% White, 4% Black, 3% multiracial. The wider county runs roughly 26% Hispanic, putting the school's mix visibly more Hispanic than the area baseline.

Looking at school resources, Staff filings list 71 full-time-equivalent teachers, which works out to roughly 10.6:1 students per teacher. That figure is tighter than the state norm's 13.0:1 average. Roughly 65% of students at Belvidere South Middle School qualify for free or reduced-price lunch, often used as a Title I proxy. Set against Boone County (around 53%), the school's rate is north of typical.

On a residual basis (actual vs predicted given the student mix), Belvidere South Middle School tracks the demographic baseline. The model predicts 33.9% given the school's FRL share; actual proficiency is 28.6%.

Around the school, community-level numbers for Boone County indicate the typical household earns roughly $84,571 per year, about 24% of the adult population holds a bachelor's degree or above, and census figures put the poverty rate at about 7%. In all, Boone County runs 17 public schools (combined enrollment of about 8,993 students), of which Belvidere South Middle School is one.

Nearest neighbor: Belvidere High School, around 0.2 miles off. 8 of the 8 nearest public schools sit inside a five-mile radius. Among the 9 schools in that immediate cluster with test data (this one included), Belvidere South Middle School ranks 6th on composite proficiency, beneath the local average of 30.9%.

Belvidere South Middle School operates from a bedroom-community location.

Five-year trend. Belvidere South Middle School's enrollment has ticked down 11% since 2018, when it stood at 843 (now 754). Over the same period, the Hispanic share climbed from 40% to 58%. Class-load math has pulled in: from 13.0:1 in 2018 to 10.6:1 in 2025.

On allk12, members of the Belvidere South Middle School community share and discuss science fair prep, picture-day reminders, and bus-route questions. Anyone with firsthand experience at this school can post or comment.