Off the top of my head I believe that the canon goes,
lament of Innocence, PS2, XBOX (Play through twice to get Pumpkin!)
Castlevania Legends, GB
Castlevania 3, NES
Curse of Darkness, PS2, XBOX
Casltevania Adventure 1, GB
Casltevania Adventure 2, GB
Casltevania 1, NES
Casltevania 2, NES (Almost as bad as the N64 Games)
Harmony of Dissonance, GBA
Dracula X: Rondo of Blood, SNES, PC Engine (Best Platform Castlevania Game well the PC Engine one anyway)
Symphony of the Night: Saturn, PSX (What is a Man? A mirsable pile of secrets!)
Circle of the Moon, GBA (might be non canon)
Legacy of Darkness, N64
Castlevania 64, N64
Castlevania Bloodlines, SEGA MEGA AWSEOME DRIVE! (2nd Best Platfrom Castlevania game!!!)
Portrait of Ruin, NDS (Johnathon! Charlotte! Johnathon! Charlotte! Johnathon! Charlotte!)
Aria of Sorrow, GBA (Best ARRR-PG Castlevania!)
Dawn of Sorrow, NDS
and the rest are non canon.
Ta-Da!!