- Maphead: Charting the Wide, Weird World of Geography Wonks 592 copies, 35 reviews
- Brainiac: Adventures in the Curious, Competitive, Compulsive World of… 476 copies, 19 reviews
- Because I Said So!: The Truth Behind the Myths, Tales, and Warnings Every… 166 copies, 9 reviews
- Ken Jennings's Trivia Almanac: 8,888 Questions in 365 Days 77 copies
- Greek Mythology (Ken Jennings' Junior Genius Guides) 15 copies, 1 review
- Maps and Geography (Ken Jennings' Junior Genius Guides) 15 copies, 2 reviews
- U.S. Presidents (Ken Jennings' Junior Genius Guides) 8 copies
- Outer Space (Ken Jennings' Junior Genius Guides) 3 copies
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