The landslide was triggered by monsoon rains on Thursday, smashing into a village in Raigad district, a hilly and forested site about 100 kilometres (62 miles) from Mumbai.
Emergency teams have been digging for bodies under the mounds of earth and rubble.
"We've so far counted 27 bodies, and about 50 to 60 people are still missing, but there are multiple challenges for rescue work at the site," Raigad official Yogesh Mhase told AFP on Sunday.
Mhase said the remote hamlet was about five kilometres from the nearest road.
"No heavy equipment can reach this site, we only have small machines and most work has to be done manually," he added.
"Non-stop heavy rains in the region are also making the entire operation much more challenging".
The top district official said he was not optimistic about finding survivors on the fourth day of the ongoing rescue.
Local media reports said that several families were entirely wiped out, while other survivors were the only ones left alive among their relatives.
India has been battered by rains since the start of the monsoon season in June, and flooding and landslides have killed scores of people.
Monsoon rains are vital to replenishing rivers and groundwater, but the deluge also causes widespread destruction every year.
Experts say climate change is increasing the number of extreme weather events around the world, with damming, deforestation and development projects in India exacerbating the human toll.
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