Summary:
Zip code 73448 has one high school, Marietta High School, serving grades 9–12, with 288 students and a 16.5:1 student–teacher ratio. Its 2025–2026 results show a mixed academic picture: English Language Arts I and U.S. History matched state proficiency rates, while science and especially mathematics fell short. The most important concern is mathematics: 2% of students were proficient, 23 percentage points below the state rate of 25%.
There is no second high school in this list to compare for a local top or bottom position. Within Marietta High School, all-grades ELA I proficiency was 26%, matching the state and 6 points above the Marietta district; U.S. History was 41%, matching both. Science was 18%, 12 points below the state and 13 below the district. The 11th-grade results also show U.S. History matching the state, while ELA was 10 points below and mathematics 15 points below. Completion and attendance indicators compare favorably with state figures: the 2024–2025 graduation rate was 86%, 9 points above the state and equal to the district. Chronic absenteeism in 2025–2026 was 4%, 12 points below the state, though 1 point above the district.
Scores improved in science and U.S. History, but not in mathematics: from 2024–2025 to 2025–2026, science rose 3 points and U.S. History 5, while ELA and mathematics were unchanged. The average gap across the four subjects narrowed by 3 points, but mathematics remained at 2%. SchoolDigger’s ranking percentile rose from 16th in 2023–2024 to 33rd in 2025–2026; this is a separate indicator, not evidence that every subject improved. As context, 80% of students were free/reduced lunch eligible in 2024–2025; that figure describes the school and does not explain its results.
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