Summary:
Zip code 61951 has three schools in Sullivan CUSD 300: Sullivan Elementary (PK–5, 565 students), Sullivan Middle (grades 6–8, 266 students) and Sullivan High (grades 9–12, 317 students). The clearest shared pattern at the elementary and middle schools is stronger all-grades performance in ELA than in math compared with the state: ELA was 1 and 4 percentage points above state results, while math was 5 points below at both schools.
Results vary notably by grade and subject, so no single school is strongest across the board. Sullivan Elementary fifth graders were 10 points above the state in ELA and 15 points above in science, but 17 points below in math—the largest negative grade-level comparison in the data. Sullivan Middle stood out in eighth-grade ELA, 6 points above the state; its eighth-grade science was 6 points below. At Sullivan High, grade 10 was above the state in all three subjects, by 7 to 15 points, while grade 11 was below in every subject, including 16 points below in science. The high school’s graduation rate was 93%, 3 points above the state.
Recent changes are mixed: elementary’s all-grades ELA advantage narrowed by 13 points from 2024–2025 to 2025–2026, and its math comparison shifted from 4 points above the state to 5 below; middle’s ELA advantage narrowed by 2 points, while its math comparison was nearly unchanged. Science comparisons improved at both schools. SchoolDigger’s reported percentile rankings also fell in the latest year for Elementary (65 to 47) and Middle (63 to 44), while High changed from 65 to 62. For context, 2024–2025 free/reduced lunch eligibility was 51% at Elementary, 47% at Middle and 44% at High; student–teacher ratios were 18.4, 16.3 and 14.9, respectively. Chronic absenteeism was below the statewide 24% at all three schools: 10%, 14% and 15%, respectively. Because the schools serve different grades, these figures are best read as school-specific context rather than a direct ranking.
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