IsStatenIsland
https://ziplook.house.gov/htbin/findrep_house?ZIP=10004

This is the map of the Congressional district from house.gov. This is probably a pretty authoritative source.


https://www.loc.gov/law/help/statutes-at-large/23rd-congress/Session%201/c23s1ch126.pdf

The 1834 interstate compact established the two exclaves of New York and the boundary between New York and New Jersey. The compacts only covered the land as part of the islands at the time, so the piers are actually entirely in New Jersey.

I will go ahead and remove the other pier from the exclave boundary.