To find the numerical order of a book in a series...
Young Adult Books in Series and Sequels
Manga Collection
Fullmetal Alchemist
Hikaru No Go
Chibi Vampire
Rurouni Kenshin
Death Note
One Piece
Scott Pilgrim
Fruits Basket
Dragon Ball Z
Dragon Drive

Looking for something good to read? If you liked...
Divergent by Veronica Roth
Plus One by Elizabeth Fama
Delirium by Lauren Oliver
Starters by Lissa Price
The Testing by Joelle Charbonneau
Matched by Allyson Braithwaite Condie
Looking for Alaska by John Green
Paper Covers Rock by Jenny Hubbard
Please Ignore Vera Dietz by A.S. King
Out of Reach by Carrie Arcos
Winger by Andrew Smith
Two or Three Things I Forgot to tell you by Joyce Carol Oates
Matched by Allyson Braithwaite Condie
Divergent by Veronica Roth
The Program by Suzanne Young
The Adoration of Jenna Fox by Mary Pearson
The Giver by Lois Lowery
Plus One by Elizabeth Fama 
Twilight by Stephenie Meyer
Dead Beautiful Yvonne Woon
Shiver by Maggie Stiefvater
Blue Bloods by Melissa de la Cruz
House of Night by P.C. Cast
Vampire Academy by Richelle Mead
Vampire Diaries by L.J. Smith
Evernight by Claudia Gray
Chibi Vampire by Yuna Kagesaki
The Hunger Games by Suzanne Collins
The Unwanteds by Lisa McMann
Blood Red Road by Moira Young
Graceling by Kristin Cashore
Matched by Allyson Braithwaite
Variant by Robison E. Wells
Ship Breaker by Paolo Bacigalupi
Life as We Knew it by Susan Beth Pfeffer
The Declaration by Gemma Malley
Unwind by Neal Shusterman
Little Brother by Cory Doctorow
The House of the Scorpion
Uglies by Scott Westerfeld
How I Live Now by Meg Rosoff