Season 4, Episode 20:
The RaptureCastiel tries to give Dean an important message in a dream, but when the boys arrive to speak with him personally they discover instead his vessel, Jimmy Novak of Pontiac, Illinois. Castiel's been recalled to Heaven for something, but Jimmy doesn't know what and just wants to go back to his wife and daughter. But the forces of Hell are after him as a former angelic vessel.
Body countFor this episode = 6 demons.For the series so far = At least 295 humans (of which 5 were witches), at least 69 demons, 28 ghosts, 10 vampires, 6 changelings, 3 gods, 3 shapeshifters, 3 zombies, 2 angels, 2 ghouls, 2 werewolves, 1 cat, 1 crocotta, 1 djinn, 1 dog, 1 rakshasa, 1 rawhead, 1 reaper, 1 rougarou, 1 shtriga, 1 siren, and 1 wendigo.