KZOK signed on in 1964 as KTW-FM and simulcasted KTW-AM (now KKDZ). The station's formats in their early years included top 40 for 9 months, then a country format they called "The Nashville Sound", talk radio (1965–1971), religious (1971–1974), progressive rock (1974–1975; 1974 was when they picked up the KZOK calls), AOR (1975–1985), and mellow rock/AAA (1985-1986); the current format debuted in December 1986. They are one of three classic rock/hits outlets targeting the Puget Sound region, with Bellingham's KISM-FM and Seattle's KJR-FM being the other two.
The station's current on-air lineup includes many Seattle personalities who have been on various rock radio stations in previous years. Danny Bonaduce (formerly of WYSP/Philadelphia) currently hosts mornings from 5:45am-9am. Gary Crow (formerly of Crow & West on KXRX) hosts middays from 10 AM-2 PM. Stacy Ireland hosts afternoons from 2pm-6pm. Nate Connors hosts nights from 6PM-10PM. Overnights (10pm-6am) are hosted by Kevin Hammond. Other staff members include Dale Roberts. Although not listed on the KZOK website staff page, Bo Roberts has been known to make appearances as a fill-in DJ.
Television host and comedian Jimmy Kimmel co-hosted a morning show on KZOK in 1989.
Long time KZOK and former KISW personality Steve Slaton left the station in December 2008, creating a stir among his fans.
From 2001-September 2010, notable comedy song writer and comedian Bob Rivers hosted morning drive. In September 2010, Rivers, along with other show cast members, were dismissed from KZOK because of inability to reach a contract renewal agreement with CBS Radio. Rivers is now at KJR-FM.
Previous announcers include Scott Vanderpool, Steve Slaton, Robin Erickson, John Maynard, Gary Lockwood, Burl Barer, Danny Holiday (Daniel Thygesen), John Langan, Matt Riedy, John Rody, John Posey, Phil Strider, Carl Palmer, Tom Killorin, Chris Russell, Marty Riemer, Dr. Rock (Jeff McIntosh), Bob Hovanes, Mike Jones, Larry Sharp, Darren Erickson, Craig Martin, Mike Bell, Connie Cole, Rick Riley (known as Rick Shannon), Steven VanderMate (Steve Fox), and Suds Coleman.