All commercial radio and television stations in the US have call signs starting with K or W. The division is geographic -- west coast stations use K; east coast stations use W. (The dividing line is, roughly speaking, drawn at the Mississippi River.)
It took me a while to realize there was any geographic significance. I live in a metro area split by the Mississippi, so we have a roughly 50/50 ratio of K and W stations.
All commercial radio and television stations in the US have call signs starting with K or W. The division is geographic -- west coast stations use K; east coast stations use W. (The dividing line is, roughly speaking, drawn at the Mississippi River.)