Koufos attended GlenOak High School in Canton, Ohio, where he played center for the GlenOak Golden Eagles high school basketball team. As a junior, Koufos averaged 24 points per game, 11.1 rebounds per game, and four blocked shots per game and he was named Second-Team All-State.\n', '

As a senior, Koufos averaged 25.9 points per game, 15.4 rebounds per game and 5.2 blocked shots per game. He was instrumental in GlenOak snapping Canton McKinley\'s 41-game win streak in January 2007, when he posted 32 points, 19 rebounds and 10 blocks to help the Golden Eagles edge the Bulldogs, 56–55, in overtime. The next day, Koufos recorded 32 points, 15 rebounds and seven blocks against Detroit Country Day, to lead GlenOak to its ninth consecutive victory.\n', '

Koufos finished second to future Buckeye teammate Jon Diebler in the Mr. Ohio Basketball voting. After his senior season with GlenOak, Koufos was named the Division I player of the year and was also named First-Team All-State. He also earned First-Team Northeast Inland All-District and third-team Parade All-American honors and participated in the 2007 McDonald\'s All-American Game and 2007 Jordan Brand Classic.\n', '

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