| Unconventional Science (6 titles) |
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| Underground Animals (8 titles) |
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| Understanding Disabilities (6 titles) |
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| Understanding You (6 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 (39 titles) |
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| United States Presidents (2021) (46 titles) |
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| Up2U Adventures Set 1 (6 titles) |
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| Up2U Adventures Set 2 (3 titles) |
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| Up2U Adventures Set 3 (2 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 Encyclopedias (4 titles) |
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| US Military Equipment and Vehicles (6 titles) |
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| US Symbols (6 titles) |
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| Versus (5 titles) |
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| Versus (6 titles) |
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| Video Game Encyclopedias (4 titles) |
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| Video Game Heroes Set 1 (6 titles) |
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