Local coroner Frank Miller confirmed that the women were found at the home of 50-year-old sex offender Anthony Sowell.
Mr Miller added that most of the victims appeared to have been strangled.
Police earlier confirmed that three bodies were found at the home, and that the bodies of three more victims were believed to have been discovered.
Released in 2005 after spending 15 years in prison for a 1989 rape, Sowell was arrested in his Cleveland neighbourhood after a local resident recognised him and notified police.
He had been walking down a street and did not resist arrest, police said.
The first two bodies were found on Thursday when a SWAT team entered the house with a search warrant.
Further searches of the property led to the discovery of four more bodies. Of the six bodies, five were found in the home and one was buried in a grave in the yard.
