Greenville High School is a public high school in Greenville, Ohio. Greenville is the county seat of Darke County and GHS is the only high school in the Greenville City Schools district.Ohio High School Athletic Association State Championships Girls Softball - 2007Alumni Matt Light, three-time Super Bowl winner as offensive tackle with the New England Patriots. His high school number, 87, has been retired. Jack Baldschun, nine-year Major League baseball pitcher for the Philadelphia Phillies, Cincinnati Reds and San Diego Padres. Ed Olwine, three-year Major League Baseball piitcher for the Atlanta Braves.