The Last Olympian is the last book in Percy Jackson in the Olympians, but there is a companion series called The Heroes of Olympus that happens after the first series. The first book of this is called The Lost Hero. After that there is a second book called The Son of Neptune.
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The Titan's Curse
It goes in this order
1.The Lightning Thief
2.The Sea of Monsters
3.The Titan's Curse
4.The Battle of the Labyrinth
5.The Last Olympian
Next Series (sequel to previous series):
The Lost Hero
Son of Neptune
Mark of Athena
House of Hades
The Blood of Olympus
There is also a collection of short stories written from different heroes perspectives called Demigod Diaries.
There is also an interactive map of Camp Jupiter and an Exploration of the Argo II on Rick Riordan's website.
Although not actually a Percy Jackson book, the book after The Mark Of Athena is House of Hades, being released in October, 2013.
The Sea of Monsters.
It is called The Sea of Monsters
The second one is about three demigods: Jason, Piper and Leo. Percy Jackson, Annabeth Chase, and Grover Underwood appear, too. The second series is called "The Heroes of Olympus". There will be a total of 5 books. The first book is "The Lost Hero". The second is called "The Son of Neptune". Both titles refer to Percy Jackson, since Percy Jackson is a hero and he is lost somewhere at the Roman Camp-Half Blood, and since Percy is a son of Poseidon, and Poseidon's Roman counterpart is Neptune.
No. Percy Jackson and the Olympians is the full name of the series, while Percy Jackson is the shortened, abbreviated name people like to use (it's a lot easier to say). The real second book of the series is Percy Jackson and the Sea of Monsters.
There is no book 6 in The Percy Jackson series.