At least 479 people were killed after heavy rains unleashed mudslides before dawn on Friday, burying people while they slept in three cities north of Rio in what is one of Brazil's deadliest natural disasters on record.
Dozens of funerals were planned for Friday and 300 more graves will be dug on Saturday.
"We'll make room. We have to. We'll stay up here until 10 p.m., midnight if we can, and we'll be here at 6 a.m. tomorrow," said Vitor da Costa Soares, a city worker in charge of the cemetery.
Local reports said hundreds were still missing.
"I have friends still lost in all of this mud," said Carlos Eurico, a resident of Campo Grande, as he motioned to a sea of destruction behind him. "It's all gone. It's all over now. We're putting ourselves in the hands of God."
Authorities have estimated that 14,000 people fled their homes.
Hundreds of rescuers were in the area and officials said lack of help was not a problem - rather it was trying to access remote areas isolated after roads were washed out.
Officials said the area hit by slides had seen 10 inches of rain in less than 24 hours. More rain is forecast through the weekend.