Summary:
ZIP code 66415 has two schools in the Vermillion district: Centralia Elementary, serving prekindergarten through grade 6, and Centralia High, serving grades 7–12; together they enroll 342 students. The clearest difference is in 2025–26 test results: Elementary was well above the state in all three subjects, while High was close to the state overall. The most important finding for families is that results vary substantially between the two schools, especially in science.
Centralia Elementary stands out as the stronger all-grades test performer: its proficiency was 64% in ELA, 68% in math, and 88% in science, compared with 45%, 39%, and 38% at Centralia High. That puts Elementary ahead by 19 percentage points in ELA, 28 in math, and 49 in science. Elementary also exceeded state results in every reported grade-level comparison. High’s all-grades ELA and math results were slightly below the state, while science was essentially even; its grade-level results varied, including grade 8 ELA 13 points above the state and grade 10 ELA 6 points below. SchoolDigger ranked Elementary at the 90th statewide percentile in 2025–26, compared with the High’s 57th percentile.
Recent changes make the comparison more mixed: from 2024–25 to 2025–26, Elementary’s science result rose 11 percentage points, while its math result fell 7 and ELA was nearly unchanged. High’s results fell 2 points in ELA, 21 in math, and 26 in science. SchoolDigger’s percentile rankings show a similar contrast: Elementary stayed near 90 over three years, while High rose from 32 to 63 and then dipped to 57. Other measures offer context: Elementary had a 14.4 student-teacher ratio and a 25% free/reduced-lunch rate; High had a 10.2 ratio and a 28% rate. Chronic absenteeism was below the 18% state rate at both schools—1% at Elementary and 7% at High. These schools serve different grade spans, so their all-grades results are not direct comparisons of the same grades.
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