I initially wasn't going to do this, since there wasn't a list, but I just saw one was added. Rather than going location by location at this point, I went through the posted lists and added the location(s) I saw them at. I didn't much track of birds and herps before a few years ago, so not sure what's new to me of those.
1. Tasmanian Devil (Columbus)
2. Matschie’s Tree Kangaroo (Columbus)
3. Brush-tailed Bettong (Smithsonian, Columbus)
4. Koala (Columbus)
5. Addax (Six Flags, Brights Zoo, Keystone Safari)
6. Aoudad (Six Flags, Briarwood Ranch, Catoctin)
7. Banteng (Keystone Safari)
8. Rhim Gazelle (Columbus)
9. Lowland Anoa (Roer’s Zoofari)
10. Addra Gazelle (Six Flags, Brights Zoo, Columbus)
11. Beisa Oryx (Six Flags)
12. Scimitar-horned Oryx (Six Flags, Virginia Safari, Brights Zoo, Catoctin)
13. Pere David’s Deer (Virginia Safari Park, Briarwood Ranch, Keystone Safari)
14. Reindeer (Keystone Safari, Columbus)
15. Giraffe (Roer’s, Turtle Back, Virginia Safari, Claws N Paws, Brights, Columbus, Keystone Safari, Six Flags)
16. Okapi (Columbus)
17. Siberian Musk Deer (Columbus)
18. Visayan Warty Pig (Catoctin)
19. Fossa (Catoctin)
20. Cheetah (Smithsonian, Roer’s, Columbus, Virginia Safari)
21. Mainland Clouded Leopard (Smithsonian)
22. Lion (Keystone Safari, Six Flags, Turtle Back, Claws N Paws, Columbus)
23. Leopard (Claws N Paws, Living Treasures, Columbus, Turtle Back, Catoctin)
24. Tiger (Six Flags, Plumpton Park, Claws N Paws, Virginia Safari, Living Treasures, Columbus)
25. Snow Leopard (Turtle Back, Claws N Paws)
26. Fishing Cat (Smithsonian)
27. Asian Small-clawed Otter (Claws N Paws, Brights, Catoctin, Columbus)
28. Black-footed Ferret (Smithsonian, ZooAmerica)
29. Giant Panda (Smithsonian)
30. Sun Bear (Catoctin)
31. Sloth Bear (Columbus)
32. Polar Bear (Columbus)
33. Binturong (Claws N Paws, Rainforest Adventures, Catoctin)
34. Grevy’s Zebra (Keystone Safari, possibly others)
35.Baird’s Tapir (Brights Zoo)
36. Giant Anteater (Virginia Safari, Brights)
37. Nancy Ma’s Night Monkey (Pocono Snake & Animal Farm)
38. Black Spider Monkey (Living Treasures, Virignia Safari)
39. Geoffroy’s Spider Monkey (Brights)
40. Golden-headed Lion Tamarin (Virginia Safari, Rainforest Adventures)
41. Golden Lion Tamarin (Smithsonian)
42. Cotton-top Tamarin (Pocono, Rainforest Adventures, Brights, Living Treasures)
43. Booted Macaque (Catoctin)
44. Mandrill (Keystone, Columbus)
45. Western Lowland Gorilla (Smithsonian)
46. White-handed Gibbon (Claws N Paws, Brights, Living Treasures, Leesburg Animal Park)
47. Northern White-cheeked Gibbon (Turtle Back)
48.Siamang (Plumpton Park, Columbus)
49. Ring-tailed Lemur (Pocono, Claws N Paws, Luray, Virginia Safari, Roer’s, Rainforest Adventures, Brights)
50. Red-ruffed Lemur (Roer’s, Brights, Living Treasures, Columbus)
51. Black-and-white Ruffed Lemur (Brights, Catoctin)
52. Asian Elephant (Smithsonian, Columbus)
53. Long-tailed Chinchilla (Smithsonian, Pocono, Claws N Paws, Rainforest Adventures)
54. West Indian Manatee (Columbus)
55. North Island Brown Kiwi (Columbus)
56. Double-wattled Cassowary (Turtle Back, Keystone, Catoctin)
57. Black Curassow (Virginia Safari)
58. Cabot’s Tragopan (Catoctin)
59. Hawaiian Goose (Columbus)
60. Western Crowned Pigeon (Catoctin)
61. Grey Crowned Crane (Brights, Keystone)
62. White-naped Crane (Keystone)
63. Sarus Crane (Brights)
64. Red Crowned Crane (Catoctin)
65. Humboldt Penguin (Columbus)
66. African Penguin (Turtle Back, Virginia Safari, Ripley’s Aquarium of the Smokies)
67. Cape Vulture (Brights)
68. Ruppell’s Vulture (Virginia Safari)
69. Southern Ground Hornbill (Brights, Keystone)
70. Channel-billed Toucan (Brights)
71. Umbrella Cockatoo (Claws N Paws, Brights)
72. Moluccan Cockatoo (Plumpton Park)
73. African Grey Parrot (Brights, Columbus)
74. Hyacinth Macaw (Plumpton Park, Claws N Paws, Brights, Catoctin)
75. Military Macaw (Catoctin)
76. Sun Conure (Rainforest Adventures, Catoctin)
77. Bali Mynah (Columbus)
78. Yellow-spotted Amazon River Turtle (Columbus)
79. Roti Island Snake-necked Turtle (Columbus)
80. Fly River Turtle (Electric City Aquarium, Columbus)
81. Asian Narrow-headed Softshell Turtle (Columbus)
82. Spotted Turtle (Luray, Columbus)
83. Wood Turtle (Luray)
84. Eastern Box Turtle (Pocono, Luray, Virginia Safari)
85. Chinese Box Turtle (Columbus)
86. Spiny Turtle (Columbus)
87. Vietnamese Pond Turtle (Columbus)
88. Malaysian Giant Pond Turtle (Columbus)
89. Pancake Tortoise (Columbus)
90. Asian Brown Tortoise (Columbus, Catoctin)
91. Common Spider Tortoise (Columbus)
92. Burmese Star Tortoise (Columbus)
93. Aldabra Tortoise (Virginia Safari, Brights, Catoctin, Keystone)
94. Radiated Tortoise (Virginia Safari)
95. African Spur-thighed Tortoise (Barn Hill Preserve, Briarwood Ranch, Brights, Pocono, Claws N Paws, Catoctin, Rainforest Adventures)
96. Alligator Snapping Turtle (Pocono, Claws N Paws, Luray, Electric City, Columbus)
97. Loggerhead Sea Turtle (Turtle Back)
98. Green Sea Turtle (Turtle Back, Ripley’s Aquarium of the Smokies)
99. Hawksbill Sea Turtle (Columbus)
100. Crested Gecko (Roer’s, Electric City)
101. Henkel’s Leaf-tailed Gecko (Leesburg, Columbus)
102. Standing’s Day Gecko (Rainforest Adventures)
103. Chinese Crocodile Lizard (Turtle Back, Columbus)
104. Komodo Dragon (Turtle Back)
105. Mexican Alligator Lizard (Electric City)
106. Rhinoceros Iguana (Catoctin)
107. Grand Cayman Blue Iguana (Columbus)
108. Woma Python (Catoctin)
109. Burmese Python (Plumpton Park, Claws N Paws, Virginia Safari, Rainforest Adventures, Ripley’s)
110. Mangshan Pit Viper (Catoctin)
111. Black & White Spitting Cobra (Electric City)
112. King Cobra (Luray, Electric City, Catoctin, Columbus)
113. Tomistoma (Turtle Back)
114. Panamanian Golden Frog (Columbus)
115. Golfodulcean Poison Frog (Electric City, Rainforest Adventures)
116. Golden Poison Frog (Electric City)
117. Terrible Poison Frog (Electric City, Columbus Zoo)
118. Lake Titicaca Frog (Columbus)
119. Axolotl (Electric City)