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There are 28 including ( and their house)

Hufflepuff Hannah Abbott
Gryffindor Katie Bell
Hufflepuff Susan Bones
Ravenclaw Terry Boot
Gryffindor Lavender Brown
Ravenclaw Cho Chang
Ravenclaw Michael Corner
Gryffindor Colin Creevey
Gryffindor Dennis Creevey
Ravenclaw Marietta Edgecombe
Hufflepuff Justin Finch-Fletchley
Gryffindor Seamus Finnegan
Ravenclaw Anthony Goldstein
Gryffindor Hermione Granger
Gryffindor Angelina Johnson
Gryffindor Lee Jordan
Gryffindor Neville Longbottom
Ravenclaw Luna Lovegood
Hufflepuff Ernie MacMillan
Ravenclaw Padma Patil
Gryffindor Parvati Patil
Gryffindor Harry Potter
Hufflepuff Zacharias Smith
Gryffindor Alicia Spinnet
Gryffindor Dean Thomas
Gryffindor Fred Weasley
Gryffindor George Weasley
Gryffindor Ginny Weasley
Gryffindor Ron Weasley
Gryffindor Nigel Wespurt (film adaptation)