Well, technically, that’s still only one state. And one province, and two countries, but that’s a separate matter.
Thanks for that, it’s interesting there are so many ZIP codes that cross state lines.
The anomaly at the Kentucky bend is likely due to how the definition of the border between the states is defined. It can’t be part of Tennessee, because it’s north of the line that demarcates TN. It can’t be part of Missouri, because it’s on the wrong side of the river. Thus it must be in Kentucky, because that’s the state that has the land on that side of the MS river and north of that parallel, even if it’s not connected by land to the rest of Kentucky…
So tiny that no one lives there year-round.