Saint Mark's High School is a coeducational Roman Catholic high school located at 2501 Pike Creek Road, in unincorporated New Castle County, Delaware, with a Wilmington postal address. The school is administrated by the Roman Catholic Diocese of Wilmington. It is accredited by the Middle States Association of Colleges and Schools.
Notable alumni
Nicole Bosso, former Miss Delaware USA
John Carney, Mayor of Wilmington (2025–Present), Governor of Delaware (2017–2025), former U.S. Representative from Delaware (2011-2017) and former Lieutenant Governor of Delaware (2001–2009)
Louis Carlet, union organizer
Tom Douglas, Seattle chef and restaurateur
Kevin Mench, retired Major League Baseball player.
Mario Pino, horse racing jockey
David Plouffe, campaign manager for Barack Obama
Keith Powell, television actor
Pedro Swann, former MLB player
Steve Watson, NFL wide receiver