Mariner competes in the WESCO 4A Conference, their rivals include Everett High School as well as Henry M. Jackson High School and Cascade High School. The Marauders football team led the group towards the WIAA State Tournament in 1998, however fell short of a championship title losing to Capitol High School. Thus, Mariner boys basketball showcased their talents as top contenders at the 1998-1999 Hardwood Classic finishing 3rd in state playoffs. The Marauders football team made WIAA State Tournament appearances in 2006-2007, then again by the following season 2007-2008. Meanwhile, Marauders boys basketball team made three consecutive trips to state in 2006-2007, 2007–2008, and the 2008-2009 seasons. In addition, Mariner Marauder soccer team competed in two WIAA State Tournament in 2010-2011, then again 2015-2016 which both resulted in tough losses finishing the season as quarter finalist. Nonetheless, Marauders football established their program by making three straight postseason appearances from 2014-2015, 2015-2016, then again 2016-2017. However, Marauders of 2016-2017 were victorious on the road against highly touted Kennedy Catholic High School resulting 51-6 in the regional matchup; Making their first appearance in the 4A WIAA Gridiron Classic, since the previous decade.
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Mariner High School was a recipient of the Achievers Scholarship which was funded by The Bill & Melinda Gates Foundation. This scholarship was provided to Washington State's high crime, low-income areas. Most of the Achievers schools were focused in urban areas: Tacoma, Seattle and Everett. There were 16 Achievers schools, unfortunately the Achievers Scholarship program has ended, the last cohort being the Class of 2010. The scholarship program made a significant and positive difference in the lives of myriad Mariner High School graduates. This high school contains a variety of backgrounds and cultures that led to it being the most diverse high school among South Everett. Being related to that, a new after school club was created in the school year of 2017-18, which is often only seen in community colleges and universities. This after school club is named M.E.Ch.A , this after school club is organized by two students of color from the graduating class of 2019. Who offer an outreach to first generation students attending higher education. Mariner High School M.E.Ch.A contributed with Voyager Middle School and its 8th graders getting ready to transition into high school.