His commitment comes three days after Gunnar Hoak announced he plans to transfer from Kentucky to Ohio State and four days after J.P. Andrade verbally committed as a preferred walk-on from the class of 2019.
The rush of quarterbacks into the fold comes after the cupboard had become dangerously close to empty.
Since early January, Ohio State has lost Dwayne Haskins as an early entry to the NFL draft and Tate Martell and Matthew Baldwin as transfers.
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While Martell left for Miami (Fla.) following the addition of Georgia transfer Justin Fields, Baldwin cited personal reasons for looking at leaving Columbus.
The other two quarterbacks on the roster this spring were senior Chris Chugunov and freshman walk-on Danny Vanatsky.
McCord is the second player to commit to Ohio State coach Ryan Day for 2021, joining Pickerington North five-star defensive lineman Jack Sawyer.