How many Artemis Fowl books are there?

There are eight books in the Artemis Fowl series:

1. Artemis Fowl

2. Artemis Fowl: The Arctic Incident

3. Artemis Fowl: The Eternity Code

4. Artemis Fowl: The Opal Deception

5. Artemis Fowl: The Lost Colony

6. Artemis Fowl: The Time Paradox

7. Artemis Fowl: The Atlantis Complex

8. Artemis Fowl: The Last Guardian

There's also a graphic novel:

* Artemis Fowl: The Graphic Novel

Keep in mind that the series is now considered completed, with Eoin Colfer stating he has no plans to continue it.