Callahan won four matches in his 32-man bracket, including a 12-11 thriller in the championship match.
Callahan scored victories over opponents from Kansas, Iowa, Indiana and South Dakota.
"I felt really happy. I was glad to get into the finals," Callahan said. "I was just wrestling good and hit my moves right and hard."
Callahan wasn't the only Baldwin representative at the national match. Josiah Mason, Gabe Mason and Alan Callahan also competed. Gabe Mason was 2-2 in the 12-under, 112-pound division and finished in the top eight.