As of 0800 UTC/12 a.m. PST last night, KOMO AM 1000 in Seattle is now KNWN 1000 after being forced to give up the call letters as part of the station's sale from Sinclair, which owns KOMO TV, to Lotus Communications.
I know KOMO's signal carries pretty well; I've heard it myself while driving all over Oregon, for example, and my dad's heard it in Montana and elsewhere while traveling. I recorded KOMO radio's final legal IDs, which can be heard here ...
https://youtu.be/cSIh3X3yWco