Summary:
Zip code 45833 covers Delphos, Ohio, and is served by a single middle school: Jefferson Middle School, a grades 5–8 building with 248 students and a 15.5 student–teacher ratio, operating within the Delphos City district.
Jefferson's standout subjects are Science and English Language Arts, where it beats the state in every tested grade in both years of available data. Science scores run about 13 to 15 points above the state average, and ELA about 10 to 12 points above, with 5th-grade Science at 78.9% versus 62.7% statewide and 6th-grade ELA at 78.9% versus 56.0% statewide in 2025–2026. Algebra I End-of-Course results are also consistently above state — 70.6% versus 61.6%. What makes this notable is that 70.56% of students qualify for free or reduced-price lunch, a high poverty rate, so the school is outperforming state averages despite that context. Where school and district figures differ, the school is typically the stronger of the two.
Mathematics is the clear soft spot and the only subject where the school sits below the state average overall — about 1 to 3 points under in each year. The weakness is concentrated at the entry and exit grades: 5th-grade math fell to 47.4% (11.7 points below state) in 2025–2026, and 8th-grade math was 44.4% (7.6 points below state) after just 21.1% the year before, while 6th-grade math was 8.7 points above state. Note that grade-level swings compare different students each year, and with roughly 60 students per grade, a few students move the percentages a lot. Chronic absenteeism is 18.0%, above the district's 16.5%. The building's accountability rating is 3 stars at the 64th percentile in 2025–2026, up from the 56th the prior year but still below the district's 4 stars at the 71st percentile.
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