There are 42 books in the Magic Tree House: Fact Trekker series. The newest book is Narwhals and Other Whales .

1
Dinosaurs

By Mary Pope Osborne , Will Osborne, Sal Murdocca (illustrator)

Book cover of Dinosaurs
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better.

Track the facts with Jack and Annie!!

When Jack and Annie got back from their adventure in Magic Tree…
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2
Knights and Castles

By Mary Pope Osborne , Will Osborne, Sal Murdocca (illustrator)

Book cover of Knights and Castles
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better.  Track the facts with Jack and Annie!!

When Jack and Annie got back from their adventure in Magic Tree…

3
Mummies and Pyramids

By Mary Pope Osborne , Will Osborne, Sal Murdocca (illustrator)

Book cover of Mummies and Pyramids
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better.  Track the facts with Jack and Annie!!
 
When Jack and Annie got back from their adventure in Magic Tree…

4
Pirates

By Mary Pope Osborne , Will Osborne, Sal Murdocca (illustrator)

Book cover of Pirates
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better.  Track the facts with Jack and Annie!!
 
When Jack and Annie got back from their adventure in Magic Tree…

5
Rain Forests

By Mary Pope Osborne , Will Osborne, Sal Murdocca (illustrator)

Book cover of Rain Forests
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better.  Track the facts with Jack and Annie!!
 
When Jack and Annie got back from their adventure in Magic Tree…

6
Space

By Mary Pope Osborne , Will Osborne, Sal Murdocca (illustrator)

Book cover of Space
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better.

Track the facts with Jack and Annie!
 
When Jack and Annie got back from their adventure in Magic Tree…

7
Titanic

By Mary Pope Osborne , Will Osborne, Sal Murdocca (illustrator)

Book cover of Titanic
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better.

Track the facts with Jack and Annie!
 
When Jack and Annie got back from their adventure in Magic Tree…

8
Twisters and Other Terrible Storms

By Mary Pope Osborne , Will Osborne, Sal Murdocca (illustrator)

Book cover of Twisters and Other Terrible Storms
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!

When Jack and Annie got back from their adventure in Magic Tree House #23: Twister on Tuesday, they had lots of questions. How do tornadoes form? What kinds of…

18
Penguins and Antarctica

By Mary Pope Osborne , Natalie Pope Boyce , Sal Murdocca (illustrator)

Book cover of Penguins and Antarctica
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better. Track the facts with Jack and Annie!!
 
When Jack and Annie got back from their adventure in Magic Tree…

31
China

By Mary Pope Osborne , Natalie Pope Boyce , Carlo Molinari (illustrator)

Book cover of China: Land of the Emperor's Great Wall
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better. Track the facts with Jack and Annie!!

When Jack and Annie came back from their adventure in Magic Tree…

32
Sharks and Other Predators

By Mary Pope Osborne , Natalie Pope Boyce , Carlo Molinari (illustrator)

Book cover of Sharks and Other Predators
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better. Track the facts with Jack and Annie!!
 
When Jack and Annie came back from their adventure in Magic Tree…

33
Vikings

By Mary Pope Osborne , Natalie Pope Boyce , Carlo Molinari (illustrator)

Book cover of Vikings
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!

When Jack and Annie came back from their adventure in Magic Tree House #15: Viking Ships at Sunrise, they had lots of questions. Why did Vikings go on raids?…

34
Dogsledding and Extreme Sports

By Mary Pope Osborne , Natalie Pope Boyce , Carlo Molinari (illustrator)

Book cover of Dogsledding and Extreme Sports
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!

When Jack and Annie came back from their adventure in Magic Tree House Merlin Mission #26: Balto of the Blue Dawn, they had lots of questions. How do sled…

35
Dragons and Mythical Creatures

By Mary Pope Osborne , Natalie Pope Boyce , Carlo Molinari (illustrator)

Book cover of Dragons and Mythical Creatures
The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system!

When Jack and Annie came back from their adventure in Magic Tree House Merlin Mission #27: Night of the Ninth Dragon, they had lots of questions. What do tales…

36
World War II

By Mary Pope Osborne , Natalie Pope Boyce , Carlo Molinari (illustrator)

Book cover of World War II
In the next Magic Tree House® Fact Tracker, track the facts about World War II—with Jack and Annie!
 
When Jack and Annie came back from their adventure in Magic Tree House Super Edition #1: World at War, 1944, they had lots of questions. How did World War II begin? Why…

37
Baseball

By Mary Pope Osborne , Natalie Pope Boyce , Carlo Molinari (illustrator)

Book cover of Baseball
Track the facts about baseball-with Jack and Annie!

When Jack and Annie came back from their adventure in Magic Tree House #29: A Big Day for Baseball, they had lots of questions. When was baseball invented? What are the rules? Who was Jackie Robinson? Who are some other baseball greats?…

38
Wild West

By Mary Pope Osborne , Natalie Pope Boyce ,

Book cover of Wild West
Track the facts about cowboys, ghost towns, outlaws, and more!

When Jack and Annie came back from their adventure in Magic Tree House #10: Ghost Town at Sundown, they had lots of questions. What is a ghost town? Why do we call the Old West wild? What are cowboys? Who…

39
Texas

By Natalie Pope Boyce , Mary Pope Osborne ,

Book cover of Texas
Track the facts about the Alamo, the Galveston hurricane, and the great state of Texas!

When Jack and Annie came back from their adventure in Magic Tree House #30: Hurricane Heroes in Texas, they had lots of questions. Why is Texas called the Lone Star State? What was the Alamo?…

40
Warriors

By Mary Pope Osborne , Natalie Pope Boyce ,

Book cover of Warriors
Track the facts about warriors, weapons, and battles throughout history in this nonfiction companion to the #1 bestselling Magic Tree House series!

When Jack and Annie came back from their adventure in Magic Tree House #31: Warriors in Winter, they had lots of questions. What kinds of weapons did the…