I am trying to develop an application that can take a ZIP code and
normalize to its parent county (basically, give me a ZIP, and I'll
find the Admin2).

I've run into a problem with Manhattan ZIP codes (and I'm sure there
are others).

ZIP code 10027 = WOEID 12761358
12761358's Parent is WOEID 2459115 (Town New York)

Why isn't it's parent Manhattan or New York County (WOEID 12589342)

Similarly, New York County (12589342) does not show ZIP codes as
children, neighbors, ancestors, belongsto, siblings or parent.

It's almost like the Manhattan ZIP codes are not at all related to
Manhattan. How can this be?

Any info would be greatly appreciated.

Thanks!