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For the 2025-26 school year, there are 3 public schools serving 1,145 students in Marietta, OK (there are , serving 7 private students). 99% of all K-12 students in Marietta, OK are educated in public schools (compared to the OK state average of 95%).

The top-ranked public schools in Marietta, OK are Marietta Elementary School, Marietta High School and Marietta Middle School. Overall testing rank is based on a school's combined math and reading proficiency test score ranking.

Marietta, OK public schools have an average math proficiency score of 28% (versus the Oklahoma public school average of 25%), and reading proficiency score of 20% (versus the 27% statewide average). Schools in Marietta have an average ranking of 5/10, which is in the bottom 50% of Oklahoma public schools.

Minority enrollment is 63% of the student body (majority Hispanic), which is more than the Oklahoma public school average of 56% (majority Hispanic and American Indian).