There are about 110 “Magic Tree House” books in total, if you count both the stories and their nonfiction companions.

Quick Scoop: The Numbers

Most people online talk about the series in three parts:

  • About 66 fiction books (this includes the original Magic Tree House books plus the Merlin Missions).
  • 44 nonfiction Fact Tracker companions (they give real-world facts to match the adventures).
  • That makes around 110 books altogether , with more still being added over time.

Some blog-style sites and forums note slightly different counts (for example, 36–38 “main” titles if you only mean the original-numbered run), which is why you might see lower numbers like “70+ overall” or “37 in the main series” being quoted. The higher 110-ish total comes from treating all Jack-and-Annie titles—original series, Merlin Missions, and Fact Trackers—as part of the same Magic Tree House universe.

So if your question is “how many Magic Tree House books are there right now?” the most complete, up-to-date answer is: about 110 books across the whole franchise, and counting.

TL;DR:

  • Main fiction + Merlin Missions: ~66 books.
  • Fact Trackers: 44 books.
  • Whole Magic Tree House universe: ~110 books total so far.

Information gathered from public forums or data available on the internet and portrayed here.