As of February 22, 2011, there are 21.
the answer is six. all warriors series has six books, not counting the the field guides and super editions.
6 in each.
There are two volumes of Warriors : Ravenpaw .
There is going to be 6 books total in the whole series.
In total, there are 24 Heartland series books.
37 books total in the series.
There are a total of seven books in "The Unwanteds" series written by Lisa McMann.
There are a total of five books in the Tairen Soul Series by C.L. Wilson.
There are six books in the New Prophecy series, Midnight, Moonrise, Dawn, Starlight, Twilight, Sunset.
Millions of people read Warriors.
Heavystep, a ThunderClan warrior in the Warriors series, dies twice in different books: once in a battle against ShadowClan in the original series and then again in a battle against the badgers in the later series.
There are four general series Warriors, Warriors: The New Prophecy, Warriors: The Power Of Three, and Warriors: Omen Of The Stars. In the first series ,Warriors, there are 6 Books: Into The Wild, Fire And Ice, Forest Of Secrets, Rising Storm, A Dangerous Path, and The Darkest Hour. In the second series, Warriors: The New Prophecy there are 6 books: Midnight, Moonrise, Dawn, Starlight, Twilight, and Sunset. In the third series, Warriors: The Power Of Three there are 6 books: The Sight, Dark River, Outcast, Eclipse, Long Shadows, and Sunrise. In the fourth series, Warriors: Omen Of The Stars there are currently 3 books: The Fourth Apprentice, Fading Echoes, and Night Whispers. The author Erin Hunter will write 3 more books in this series.There are also 9 Mangas (3 about Graystripe's adventure, 1 about Scourge, 3 about Tigerstar and Sasha, and currently 2 about Ravenpaw, with a third coming out soon).3 "Super Editions" (Firestar's Quest, Bluestar's Prophecy, and Skyclan's destiny).There are 4 guides about the Clan's life. (Cats of The Clans, Codes of the Clans, Warriors Field guide, Battles of the Clans)P.S. Erin Hunter is going to write many more books today, tomorrow, and in the future!so your answer is approx. 37 books in the warriors series