Summary:
ZIP code 66755 has three schools in the Marmaton Valley district, serving preschool through grade 12: Marmaton Valley Elementary (134 students), Marmaton Valley High (135), and Marmaton Valley Virtual School (7). The Virtual School has no supplied test scores, so score comparisons cover the other two schools. The biggest difference is between the elementary and high schools: in 2025–26, the elementary school was ahead by 31 percentage points in math and 32 points in science, though their different grade spans make these broad comparisons rather than grade-for-grade ones.
Marmaton Valley Elementary stands out in All-Grades results, scoring 47% in ELA, 62% in math, and 64% in science—1, 21, and 26 points above the state, respectively. By contrast, Marmaton Valley High scored 37%, 31%, and 32%, below the state by 8, 10, and 6 points. High has notable exceptions: grade 6 was 30 points above the state in ELA and 12 points above in math, while grade 10 ELA was 6% compared with 41% statewide. SchoolDigger’s 2025–26 rankings also favor Elementary: it ranks 221 of 657 (66th percentile, 3 stars), while High ranks 273 of 340 (20th percentile, 1 star).
High’s All-Grades scores rose from 2024–25 to 2025–26 by 6 points in ELA, 9 in math, and 3 in science, narrowing its gaps with the state in all three subjects. Elementary’s results were steadier: ELA fell 4 points, math rose 1, and science rose 2. Other measures offer useful context, not explanations: High has a lower student-teacher ratio (8.6 versus 10.7) and free/reduced-lunch rate (62% versus 67%), while Elementary has higher test scores in every All-Grades subject. Both schools’ chronic absenteeism rates are below the state’s 18%. High also reported a 100% graduation rate, compared with 90% statewide, although its test results remain below the state overall.
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