Well, @NNM. I really like San Diego Zoo's exhibit for Common Hippos, primarily because the underwater viewing windows are enormous and there's lots of space for big crowds. If a hippo approaches a window, then it's a thrilling sight and hippo enclosures that lack underwater viewing cannot capture those moments. I also love the European mixed-species exhibits with hippos, such as the Nyala in with them at Berlin Zoo and the Nile Lechwe at Safari Park Beekse Bergen. I can't remember if the Sitatunga at ZOOM share the same space with the hippos, but that exhibit there is amazing either way. Common Hippos are very easy to maintain in captivity, they lead long lives and they famously breed like crazy.
Another fantastic Common Hippo exhibit which I didn't highlight before is the one at Chiang Mai Zoo (Thailand), which had at least 3 hippos and was delightful. There's a river-like waterway from the holding building to the main pool, as well as a gorgeous jungle backdrop. Here it is:
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As for the Pygmy Hippo exhibit at Franklin Park Zoo (USA), it actually seems fine to me and there's a lot of mock-rock in the background and it appears to not have changed much from when I visited the zoo in 2012. However, scanning my list of 44 zoos where I've seen Pygmy Hippos, there's perhaps only 5 of them (Lincoln Park, Brookfield, Toronto, Omaha, Franklin Park) where I saw the species entirely indoors. After seeing so many Southeast Asian zoos with Pygmy Hippos outdoors in the sunshine, with wild monitor lizards and tropical birds mingling in their exhibits, it seems antiquated to keep such a large mammal indoors with zero outside access. Franklin Park's exhibit seems fine and it's probably nice and cozy for the hippos, but these days it's very much an anomaly in keeping Pygmy Hippos indoors. I don't have a huge problem with the practice, but the fact remains that very few zoos do that these days. Around 90% of the zoos I've seen have given Pygmy Hippos an outdoor exhibit.
I'll end off my hippo analysis with a final list combining both species. Check out the bottom section, where a ton of Southeast Asian zoos have both Common and Pygmy Hippos, often in multiple exhibits. There's a lot of African fauna in Asian zoos.
I have visited 92 zoos with some type of hippo (17 zoos with both species)
Common Hippo – 65 zoos
Pygmy Hippo – 44 zoos
Some of these zoos are ones I’ve visited on many occasions, but I’ve listed them only once and that is based on the first time I ever saw hippos at each zoo.
1- Alberta Game Farm/Polar Park (Canada) – Pygmy Hippo – 1975
2- Calgary Zoo (Canada) – Common Hippo – 1986
3- Greater Vancouver Zoo (Canada) – Common Hippo – 1988
4- Woodland Park Zoo (USA) – Common Hippo – 1994
5- Zurich Zoo (Switzerland) – Pygmy Hippo – 2003
6- Oregon Zoo (USA) – Common Hippo – 2005
7- San Francisco Zoo (USA) – Common Hippo – 2006
8- San Diego Zoo (USA) – Common Hippo & Pygmy Hippo – 2006
9- Denver Zoo (USA) – Common Hippo – 2006
10- Taronga Zoo (Australia) – Pygmy Hippo – 2007
11- Adelaide Zoo (Australia) – Common Hippo & Pygmy Hippo – 2007
12- Melbourne Zoo (Australia) – Pygmy Hippo – 2007
13- Lincoln Park Zoo (USA) – Pygmy Hippo – 2008
14- Brookfield Zoo (USA) – Common Hippo & Pygmy Hippo – 2008
15- Toledo Zoo (USA) – Common Hippo – 2008
16- Detroit Zoo (USA) – Common Hippo – 2008
17- Toronto Zoo (USA) – Common Hippo & Pygmy Hippo – 2008
18- Smithsonian’s National Zoo (USA) – Common Hippo & Pygmy Hippo – 2008
19- Omaha’s Henry Doorly Zoo (USA) – Pygmy Hippo – 2008
20- Memphis Zoo (USA) - Common Hippo – 2008
21- Fort Worth Zoo (USA) – Common Hippo – 2008
22- Oklahoma City Zoo (USA) – Pygmy Hippo – 2008
23- Los Angeles Zoo (USA) – Common Hippo – 2008
24- Disney’s Animal Kingdom (USA) – Common Hippo – 2008
25- Zoo Miami (USA) – Pygmy Hippo – 2008
26- Wildlife Safari (USA) – Common Hippo – 2010
27- Cheyenne Mountain Zoo (USA) – Common Hippo – 2010
28- Sedgwick County Zoo (USA) – Common Hippo – 2010
29- Kansas City Zoo (USA) – Common Hippo – 2010
30- Saint Louis Zoo (USA) – Common Hippo – 2010
31- Mesker Park Zoo (USA) – Common Hippo – 2010
32- Louisville Zoo (USA) – Pygmy Hippo – 2010
33- Milwaukee County Zoo (USA) – Common Hippo – 2010
34- Philadelphia Zoo (USA) – Common Hippo – 2010
35- Birmingham Zoo (USA) – Common Hippo – 2010
36- Montgomery Zoo (USA) – Pygmy Hippo – 2010
37- Baton Rouge Zoo (USA) – Pygmy Hippo – 2010
38- San Antonio Zoo (USA) – Common Hippo – 2010
39- Gladys Porter Zoo (USA) – Pygmy Hippo – 2010
40- ABQ BioPark Zoo (USA) – Common Hippo – 2010
41- Franklin Park Zoo (USA) – Pygmy Hippo – 2012
42- Adventure Aquarium (USA) – Common Hippo – 2012
43- ZooTampa at Lowry Park (USA) – Pygmy Hippo – 2012
44- Busch Gardens Tampa Bay (USA) – Common Hippo – 2012
45- Jackson Zoo (USA) – Pygmy Hippo – 2012
46- Dickerson Park Zoo (USA) – Common Hippo – 2012
47- Topeka Zoo (USA) – Common Hippo – 2012
48- DeYoung Family Zoo (USA) – Common Hippo – 2014
49- Tanganyika Wildlife Park (USA) – Pygmy Hippo – 2014
50- Wild Wilderness Drive-Through Safari (USA) – Common Hippo – 2015
51- Ellen Trout Zoo (USA) – Common Hippo – 2015
52- Capital of Texas Zoo (USA) – Common Hippo – 2015
53- Diergaarde Blijdorp (Netherlands) – Pygmy Hippo – 2019
54- Zoo Maubeuge (France) – Common Hippo – 2019
55- Zoo Antwerp (Belgium) – Common Hippo – 2019
56- Pairi Daiza (Belgium) – Common Hippo & Pygmy Hippo – 2019
57- Safari Parc Monde Sauvage (Belgium) – Common Hippo – 2019
58- GaiaZOO (Netherlands) – Pygmy Hippo – 2019
59- Frankfurt Zoo (Germany) – Common Hippo – 2019
60- Cologne Zoo (Germany) – Common Hippo – 2019
61- ZOOM Erlebniswelt (Germany) – Common Hippo – 2019
62- Duisburg Zoo (Germany) – Pygmy Hippo – 2019
63- Krefeld Zoo (Germany) – Pygmy Hippo – 2019
64- Safari Beekse Bergen (Netherlands) – Common Hippo – 2019
65- ZooParc Overloon (Netherlands) – Pygmy Hippo – 2019
66- Berlin Zoo (Germany) – Common Hippo & Pygmy Hippo – 2019
67- Hannover Zoo (Germany) – Common Hippo – 2019
68- Wildlands Adventure Zoo Emmen (Netherlands) – Common Hippo – 2019
69- Givskud Zoo (Denmark) – Pygmy Hippo – 2022
70- Aalborg Zoo (Denmark) – Pygmy Hippo – 2022
71- Parken Zoo (Sweden) – Pygmy Hippo – 2022
72- Copenhagen Zoo (Denmark) – Common Hippo – 2022
73- Wildlife World Zoo, Aquarium & Safari Park (USA) – Pygmy Hippo – 2023
74- Sriayuthaya Lion Park (Thailand) – Common Hippo – 2024
75- Khao Kheow Zoo (Thailand) – Common Hippo & Pygmy Hippo – 2024
76- Chiang Mai Zoo (Thailand) – Common Hippo & Pygmy Hippo – 2024
77- Chiang Mai Night Safari (Thailand) – Common Hippo & Pygmy Hippo – 2024
78- Songkhla Zoo (Thailand) – Common Hippo – 2024
79- Safari World Bangkok (Thailand) – Common Hippo – 2024
80- Taiping Zoo (Malaysia) – Common Hippo – 2024
81- Lost World of Tambun (Malaysia) – Common Hippo – 2024 (didn’t see)
82- Zoo Negara (Malaysia) – Common Hippo – 2024
83- Singapore Zoo (Singapore) – Pygmy Hippo – 2024
84- Night Safari (Singapore) – Common Hippo – 2024
85- Taman Safari III Bali (Indonesia) – Common Hippo & Pygmy Hippo – 2024
86- Surabaya Zoo (Indonesia) – Common Hippo & Pygmy Hippo – 2024
87- Taman Safari II Prigen (Indonesia) – Common Hippo & Pygmy Hippo – 2024
88- Batu Secret Zoo (Indonesia) – Pygmy Hippo – 2024
89- Solo Safari (Indonesia) – Common Hippo & Pygmy Hippo – 2024
90- Gembira Loka Zoo (Indonesia) – Common Hippo & Pygmy Hippo – 2024
91- Lembang Park & Zoo (Indonesia) – Common Hippo – 2024
92- Taman Safari I Bogor (Indonesia) – Common Hippo & Pygmy Hippo – 2024
93- Ragunan Zoo (Indonesia) – Common Hippo & Pygmy Hippo – 2024
I just realized you missed out Common Hippos in Batu Secret Zoo. Seems you didn't ride the train attraction, because the train attraction takes you to several exclusive exhibits that can not be seen through walking. Several of those species include Saltwater crocodiles, Indian Rhino, North American Elks, White Rhino, and of course, Nile Hippos, where you can feed them Taman Safari style. Meaning you would've at least saw 18 zoos with both species of Hippos had you ride on them (that also basically means every single Indonesia zoo that has a hippo except Lembang has BOTH species in their exhibit)