| Trapped in Pirate Park (6 titles) |
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| Travel Bucket Lists (6 titles) |
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| Treasure Hunters (6 titles) |
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| Ultimate Spider-Man Web-Warriors (4 titles) |
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| Ultimate Sports Road Trips (8 titles) |
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| Unconventional Science (6 titles) |
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| Underdog Sports Stories (6 titles) |
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| Understanding World Religions and Beliefs (8 titles) |
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| United States Encyclopedias (4 titles) |
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| United States of America (33 titles) |
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| United States Presidents (2021) (46 titles) |
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| Ursula's Funland (3 titles) |
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| US Armed Forces (6 titles) |
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| US Military Careers (6 titles) |
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| US Military Encyclopedias (4 titles) |
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| Vampire Wars (4 titles) |
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| Versus (5 titles) |
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| Versus (6 titles) |
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| Vertical World (6 titles) |
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| Video Game Companies (6 titles) |
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