Red titi monkey- as far as i know nobody have them in the US or in Canada
Mountain tapirs- i've seen 6 - LA zoo, SF zoo and Mountains view (canada) each had a couple.
Bairds tapir - saw only one, in SF zoo.
Giant pandas- i know the 4 zoo has them : Memphis zoo, Atlanta zoo, SD zoo and the NZ. so i guess there are around 10 in the US (someone here wrote 3?)
Sumatran rhino- LA zoo had one , and Cinceneti zoo had 3 of them (all in one family)
Red Uakari- saw them only in LA Zoo.
red wolf- saw them only in 2-3 zoos
Brown Hyeana- i know of only 1.0 in Moutains view (CA)
Sifaka- saw them only in 2 zoos - The maryland zoo and Cleavland zoo
black lion tamarin- i know only about a group in Central park zoo
vancouver marmoot- only in Mountains view
species i haven't seen or heard about in the US OR CA:
any Three toed Sloth- any one know's about them?
Pangolins, asian lions, syrian brown bears, arabic leopard.
About Hyeanas: I think most zoo faded their Hyeanas in order to bring african wild dogs, it the trend at the moment.
and about Tierpark Berlin- i agree, they have an amazing collection!