The four died in the southern county of Olt on the Danube river border with Bulgaria. A baby was also reported missing, 560 people were forced to abandon their villages and 30 km (18 miles) of roads were flooded in the county.
TV stations showed the national guard using boats to rescue residents from houses in Olt.
The government said in a statement about 2,000 homes in four southern counties were flooded and some 3,500 hectares of agricultural land inundated.
Meteorologists warned that more rain was expected over the next few days.
Romania was hit by its worst floods in 50 years in April and May, when 3,700 people in western counties on the border with Serbia and Montenegro had to be evacuated from crumbling houses. The floods caused damage worth $596 million.
- Reuters - Thomson Reuters Foundation
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