The sharp increase came as civil defence authorities in the state of Oaxaca said that 71 deaths had been confirmed in that state alone. 15 deaths have been reported in Chiapas and 4 in Tabasco.
Earlier President Enrique Pena Nieto said more than 770 tremors have been registered in the aftermath of the strongest quake to hit Mexico since 1932.
The country is observing three days of national mourning for the victims.
The search for survivors is continuing in the worst hit areas.
The army, navy and police are coordinationg rescue efforts.
The Oaxacan town of Juchitan bore the burnt of the damage. Rescuers are searchng for survivors with sniffer dogs and using heavy machinery to remove the rubble.
More than five thousand houses have been damaged and many residents have been sleeping in the streets or in their cars fearing more buildings will collapse.
Some told told La Jornada, "We need help, we can not go back to our homes, they are destroyed...we need help, we need security, the streets are not safe."
While in Chiapas, the Mexican Interior Department reported that 1,700 houses have been damaged and over 400 are completely destroyed.
Aid supplies have been arriving and water and electricity supplies are being restored.
The quake was felt in neighbouring Guatemala. The government there has issued a red alert and says more than 4,000 people have been affected but no fatalities have been reported.
Mexico has also had to contend with the approach of Hurricane Katia.
It weakened as it made landfall on Friday night.
But the storm caused heavy rains and a landslide in Xalapa, the capital of Veracruz state, left two people dead.