Like many others, I am in what is (currently) the most common category, 100-199 zoos. My current total is 126, which could grow by only a few or quite a bunch this year. In order to make Bronx my 100th zoo, I picked and chose a few of the institutions I counted (mainly variation with a museum and a theme park that included animals, and a few butterfly places) but now have grudgingly just decided to count all of them. Bronx is still my 100th in my heart though, especially considering I have no memory of a few I visited as a child, which evened out the score. Here they are, in no particular order other than the state in which they are located (which has little significance, I just used this to organize my list initially. If anybody is wondering, the state I have visited the most zoos in is Texas, with 28, followed by Florida, with 21). The year of my most recent visit is in parentheses behind the facility's name. The only facilities which may be countable to some that I don't count are the Marine Mammal Center (no permanently captive animals) and Bluebird Gap Farm (which is just a farm. They have peacocks, though it really cannot be considered a zoo).
Texas
1. SeaWorld San Antonio (2016)
2. Dallas Zoo (2017)
3. Fort Worth Zoo (2017)
4. Houston Zoo (2016)
5. Cameron Park Zoo (2016)
6. The Texas Zoo (2016)
7. San Antonio Zoo (2016)
8. Exotic Resort Zoo (2015/2016, I am not entirely sure. It is unremarkable.)
9. Gladys Porter Zoo (2016)
10. Moody Gardens Rainforest (this and the aquarium have separate admission fees, so I count them separate accordingly) (2016)
11. Moody Gardens Aquarium (2016)
12. Austin Zoo (2015)
13. Austin Nature and Science Center (2015)
14. The Meadows Center (2015)
15. Capital of Texas Zoo (2016)
16. Topsey Exotic Ranch (2016)
17. Natural Bridge Wildlife Ranch (2016)
18. Fossil Rim Wildlife Center (2016)
19. Dallas World Aquarium (2017)
20. Texas State Aquarium (2015)
21. SeaLife Grapevine (2016)
22. Children's Aquarium at Fair Park (2016)
23. Downtown Aquarium Houston (2016)
24. Caldwell Zoo (2016)
25. Ellen Trout Zoo (2016)
26. Texas Discovery Gardens (2016)
27. Animal World and Snake Farm Zoo (2016)
28. DFW Reptarium (2017)
Hawaii
29. Waikiki Aquarium (2011)
30. Honolulu Zoo (2011)
31. SeaLife Park Hawaii (2011)
California
32. Los Angeles Zoo (2015)
33. San Diego Zoo (2015)
34. San Diego Zoo Safari Park (2015)
35. San Francisco Zoo (2015)
36. Aquarium of the Bay (2015)
37. Aquarium of the Pacific (2015)
38. Monterey Bay Aquarium (2015)
39. SeaWorld San Diego (2015)
Virginia
40. Virginia Living Museum (2010)
41. Virginia Aquarium (2016)
42. Virginia Zoo (2016)
43. Virginia Safari Park (2007)
44. Busch Gardens Williamsburg (2008)
45. Metro Richmond Zoo (2016)
46. Nauticus (2008)
47. Roer's Zoofari/Reston Zoo (2016)
48. Hidden Pond Nature Center (2017)
49. Three Lakes Nature Center and Aquarium (2008)
Missouri
50. Saint Louis Zoo (2017)
51. Grant's Farm (2015)
52. Kansas City Zoo (2017)
53. SeaLife Kansas City (2012)
54. Wild Animal Safari (2012)
55. Dickerson Park Zoo (2012)
56. World Bird Sanctuary (2017)
57. Butterfly House (2009)
Maryland
58. Maryland Zoo in Baltimore (2017)
59. National Aquarium in Baltimore (2017)
60. Salisbury Zoo (2016)
61. Catoctin Mountain Wildlife Preserve and Zoo (2017)
62. Plumpton Park Zoo (2017)
Washington, D.C.
63. Smithsonian National Zoo (2018)
64. National Aquarium in DC (closed) (2008)
65. Smithsonian's National Museum of Natural History (Insect Zoo) (2017)
Pennsylvania
66. Philadelphia Zoo (2017)
67. ZooAmerica (2016)
68. Hershey Gardens (Butterfly Atrium) (2017)
69. Elmwood Park Zoo (2017)
70. National Aviary (2017)
71. Pittsburgh Zoo (2017)
New Jersey
72. Adventure Aquarium (2017)
Florida
73. SeaWorld Orlando (2010)
74. Disney's Animal Kingdom (2017)
75. Epcot (The Seas with Nemo and Friends) (2017)
76. Santa Fe Teaching Zoo (2016)
77. St. Augustine Alligator Farm (2017)
78. Lubee Bat Conservancy (2016)
79. Lowry Park Zoo (2016)
80. Florida Aquarium (2016)
81. John Pennekamp Coral Reef State Park Visitor Center and Aquarium (2017)
82. Butterfly Rainforest (2016)
83. Homosassa Springs Wildlife State Park (2017)
84. Busch Gardens Tampa (2017)
85. Jacksonville Zoo and Gardens (2017)
86. St. Augustine Aquarium (2017)
87. Lemur Conservation Foundation (not open to the public) (2017)
88. Naples Zoo at Caribbean Gardens (2017)
89. Zoo Miami (2017)
90. Frost Museum of Science (2017)
91. Palm Beach Zoo (2017)
92. Lion Country Safari (2017)
93. Brevard Zoo (2017)
Oklahoma
94. Tulsa Zoo (2012)
95. Oklahoma Aquarium (2012)
Kentucky
96. Louisville Zoo (2014)
97. Kentucky Down Under (2014)
98. Newport Aquarium (2017)
Tennessee
99. Memphis Zoo (2017)
100. Nashville Zoo (2017)
101. Aquarium Restaurant Nashville (2004-2006, unknown)
102. Zoo Knoxville (2010)
103. Chattanooga Zoo (2010)
104. Tennessee Aquarium (2010)
105. Ripley's Aquarium of the Smokies (2009)
Ohio
106. Cincinnati Zoo (2017)
107. Columbus Zoo (2017)
108. Cleveland Metroparks Zoo (2010)
Indiana
109. Mesker Park Zoo (2013)
Georgia
110. Georgia Aquarium (2010)
111. Zoo Atlanta (2010)
North Carolina
112. Sylvan Heights Bird Park (2017)
113. Duke Lemur Center (2016)
114. Greensboro Science Center (2016)
115. Carolina Raptor Center (2017)
116. North Carolina Zoo (2017)
Delaware
117. Brandywine Zoo (2017)
West Virginia
118. Oglebay's Good Zoo (2017)
New York
119. Staten Island Zoo (2017)
120. Bronx Zoo (2017)
121. Central Park Zoo (2017)
122. Prospect Park Zoo (2017)
123. New York Aquarium (2017)
124. Queens Zoo (2017)
Kansas
125. Topeka Zoo (2013)
Nebraska
126. Omaha's Henry Doorly Zoo (2017)
I think this is a very good total considering my age, and I hope it will grow a lot this year! The next addition will be next month
