I just found this site from 2015 stating the Asian Savana also has 20 dholes which is impressive. It is old so that why I'm not totally sure about them still being there but I doubt they would get rid of such a large population that's endangered in such a small amount of time.
Here is the sit for reference.
Dhole Explores New Habitat at San Diego Zoo Safari Park
In 2016 they had 29, according to their site. Indeed, the largest number in North America. By all appearances they still have them, the number could be higher now even.