Built in 1941, KIRO was the first 50,000 watt directional staion West of the The Mississippi River.

Calls: KIRO
Frequency: 710Khz
Power: 50,000 watts Non Directional Day/ Directional Night
Owner: Bonneville International Corporation
Technical information from

To see what KIRO looked liked June 29, 1941. Here are 6 PDF scans of a newspaper insert to announce KIRO’s New 50,000 watt Status. The PDF files are large but worth the Look

Page 1Page 2Page 3Page 4Page 5Page 6

Page 1 of original transmitter bid

Memo on a possible move to the KVI transmitter site?

Click on any Photo to enlarge gallery






Extra Stuff:
See The KIRO Location on or Google Maps  (opens in new window)

* Built date refers to when station transmitter site was built on Vashon Island. Not the date the station license was issued.
Photos and Text by Steven Allen

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