Per a discussion on the Discord server and another current thread, I used @TinoPup's Felids of the United States to make a comparison of where subspecific tigers can be found in the US. Here is the breakdown I have come up with so far; asterisks indicate non-AZA:
Amur Tiger, Panthera tigris...
New Tiger Exhibit Coming 2021 as part of the Kingdoms Of Asia installment at the Fresno Chaffee Zoo. This map doesn't show the entire installment, but rather just the tiger exhibits.
View of the Malayan and white tiger exhibits at Hamerton. From left: Malayan tiger enclosure (Tiger Falls); housing for Malayan and white tigers; white tiger enclosure.
Back in June , a group of American zookeepers went to Malaysia to learn more about the Malayan tiger situation and to go on "Tiger Walks" that help protect the forest. Here are the videos-
https://www.youtube.com/playlist?list=PLZaPNVLhQpLfCcj01IjWFovIBHleL_77A