The Magic Tree House series consists of multiple subseries and a large number of books overall:
- The main Magic Tree House fiction series has about 38 books published so far, aimed at young children just starting chapter books
- The Merlin Missions subseries, which is for slightly older children, includes 27 books and was originally part of the main series but is now considered separate
- There are also about 44 nonfiction Fact Tracker books that accompany the fiction stories, providing factual background related to the adventures
In total, combining fiction and nonfiction, there are approximately 110 Magic Tree House books
. Including related books and stand-alone stories, the total count can reach around 126 books
. Some sources mention slightly different numbers due to ongoing releases and reclassifications, but the most consistent and up-to-date count is around 110 books in the main series and nonfiction combined
