In 1958, the 94.9 frequency was taken over by KUOW-FM, owned by the University of Washington, and now a public news-talk station affiliated with NPR.

Concurrent with the purchase of KRSC-FM, King Broadcasting also acquired KRSC-TV (channel 5), which had signed on the previous year.

During the late 1970s, KING-FM carried syndicated concert broadcasts by the Philadelphia Orchestra, usually under direction of Eugene Ormandy, the New York Philharmonic, and the Boston Symphony.

Many of the syndicated concert programs featured well-known instrumentalists and conductors performing works which they never recorded commercially - e.g. Leonard Bernstein conducting the New York Philharmonic in a highly memorable 1976 reading of Bruckner's Sixth Symphony in A major.

Although KING-FM was owned by a non-profit entity, the station continued to operate for a time on a commercial basis, selling advertising as before.

[12] This higher-elevation transmitter location provided a significant improvement in KING-FM's reception quality in its listener area.

KING-FM also began broadcasting its programming online, becoming one of the first internet radio stations, streamed by RealNetworks c. 1995.

[13] On March 23, 2010, KING-FM announced that it would transition to a non-commercial, listener-supported public radio station in July 2011, citing reduced advertising revenue.

Successful fundraising efforts led KING-FM to announce on April 7, 2011, that the transition would instead take place on May 2, two months ahead of schedule.