Officials say many more are missing.
Officials say many more are missing.
More than two million people are now believed to be homeless because of the floods.
The army has been called out in both the Indian states and also in Bhutan, where 87 people have died in landslides since late on Friday.
Bhutanese officials said massive landslides have struck an area in excess of 60 kilometres between Chhukha and Kharbanda township in the south.
Region isolated
Road communications between the capital, Thimphu, and the country's south have been cut off .
Power lines have been washed away and many buildings are under water.
A state official told the AFP news agency that Assam's major highway and railway tracks were submerged.
Troops have mounted relief and rescue operations and helicopters have been dropping food into isolated areas.
Further flooding is expected as all rivers in north-east India are flowing at above normal levels.
Thousands of stranded people have been rescued by soldiers in the northeastern state of Assam, where rising waters of the Brahmaputra river have inundated more than 2,000 villages.
"Thousands have set up temporary homes along the highway," a rescue worker said.
Railway authorities, meanwhile, have been working to repair damaged tracks and restore rail links.
Bihar suffers
Floods have also caused death and destruction in the eastern state of Bihar.
Nearly a million people spread over hundreds of villages have been affected.
Reports say crops valued at 84 million rupees ($1.88 million) have been damaged and some 3,000 houses destroyed.
Helicopters and army boats are being pressed into service as part of a massive relief operation.
More than 100 people died last week in flash floods which hit the northern state of Himachal Pradesh.
India's neighbours - Nepal and Bangladesh - have also been affected.