Joe Marine, who was first elected in 2005 and returned to office in 2009, will be up for re-election.
Gregerson, 34, was first elected to the City Council in 2003 and was re-elected in 2007 and 2011.
A Mukilteo native, Gregerson served as council president in 2005 and 2006 and vice president in 2011 and 2012.
She works as a sales representative for Herff Jones yearbooks of Kenmore.
Gregerson is planning a campaign kickoff event for 1 p.m. Sunday at Rosehill Community Center, 304 Lincoln Ave. Light refreshments are planned.
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