The discovery was made after the home's former owner was evicted, according to officials. At least 89 different cats have been recovered so far, though there may be more.
Police Chief Arnold “Butch” Amthor said that officers described the home's conditions as "horrific," the Times Herald-Record reported.
Many of the cats' bodies were found inside cardboard boxes left in what appeared to be a mass grave behind the house, near the edge of the woods.
Some of the boxes were labeled with names and even tender messages.
“RIP Zippy you were a good little girl,” read one of the boxes.
Amthor promised a "thorough" investigation.