Summary:
DeKalb CUSD 428 includes 11 schools: eight K–5 elementary schools, two middle schools serving grades 6–8, and one high school serving grades 9–12. The clearest takeaway is that elementary results vary widely: the school range is 37 percentage points in ELA and 45 points in math, so districtwide averages hide substantial differences between schools.
Jefferson Elementary School stands out, leading the elementary schools in ELA (53%), math (54%), and fifth-grade science (51%). It is above the state in math and science; the other elementary schools average 31% in ELA, 19% in math, and 33% in science. At the lower end, Gwendolyn Brooks Elementary School has the lowest ELA (16%) and math (9%), while Malta Elementary School has the lowest fifth-grade science result (22%). Among middle schools, ELA results are nearly tied: Clinton Rosette Middle School leads Huntley Middle School by 0.2 points, though Huntley leads in math by 3 points. DeKalb High School is below state results in all three reported ACT subjects.
Average results generally improved from 2024–25 to 2025–26, but not at every school or in every subject. Elementary science rose 15 points on average, while ELA rose 7; math rose only 2. Lincoln Elementary School made gains in all three measures, including 21 points in ELA and 31 in science, while Cortland Elementary School declined in math and science. SchoolDigger rates Jefferson at the 53rd statewide percentile with 3 stars; other elementary schools with a listed rating are at the 25th percentile or below. For context, free/reduced lunch eligible measures in school year 2024–25 ranged from 57% at Jefferson to 80% at Brooks; these figures describe student populations, not what explains test results. Elementary student-teacher ratios ranged from 11.1 at Jefferson to 15.8 at Lincoln.
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