Its founder was Moritz Thomsen of the Pacific Coast Biscuit Company (hence the call sign KPCB) and it was powered at 100 watts. The station began broadcasting on April 27, 1927, as KPCB on 650 kilocycles. KIRO is Washington State's primary entry point station in the Emergency Alert System. The transmitter is off Dockton Road SW on Vashon Island. But to protect the other Class A station on AM 710, WOR New York City, and the previously allocated Class B station on 710, KSPN in Los Angeles, KIRO must use a directional antenna at night, thereby protecting those two older stations. By day, it uses a non-directional antenna. It broadcasts at the maximum power for commercial AM radio stations, 50,000 watts. The station's studios and offices are located on Eastlake Avenue in Seattle's Eastlake district. The station airs a sports radio format and is an ESPN Radio Network affiliate. KIRO (710 kHz 'Seattle Sports') is a commercial AM radio station in Seattle, Washington, owned by Salt Lake City–based Bonneville International.

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