Ueno Zoological Gardens
Shizuoka Nihondaira Zoo
Nagoya Higashiyama Zoo
Toyohashi Zoo
Himeji City Zoo
Hiroshima City Asa Zoological Park
Of the zoos contacted by the authors, Ueno and Nagoya both had two aardvarks each. The other Japanese zoos either were not contacted or did not respond. GlobalSpecies - made up of ISIS records as of 2011 - lists Nagoya as having aardvarks; I can't see anything online to refute/confirm that they still do, although ZooInstitutes also lists Nagoya (http://zooinstitutes.com/zoosrating/animal.asp?name=204).