Most rates cover the 2024-2025 school year; Oklahoma’s latest figure is from 2023-2024. The ranking uses the four-year adjusted cohort graduation rate followed by most states: the share of first-time ninth graders who earn a regular diploma within four years, adjusted for students who transfer in or out, emigrate, or die.
West Virginia placed second at 92.80%, followed by Alabama at 92.77%, Virginia at 92.70% and Tennessee at 92.30%. Florida ranked sixth at 92.20%, and Wisconsin seventh at 92.00%. At the bottom, Arizona recorded 80.00%, New Mexico 80.63% and Vermont 82.00%, ahead of Oklahoma at 82.20%.
Graduation rates are used by state and local governments to track educational progress, but they are not directly equivalent measures: states set different course and testing requirements for earning a diploma. The data compilation also compares each state’s public-school spending per pupil and median household income.
A high school diploma is associated with higher earnings. Census data cited in the source show that US adults aged 25 or older with a high school degree earn an average of $8,216 more annually than adults without one.

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