KCNA also reported casualties in Jagang and South Hamgyong provinces but did not say how many, nor clarify if people were injured or had died.
The news agency had previously reported heavy rains fell in the country in mid- to late July, but those earlier reports did not mention flooding or damage.
State media in the reclusive communist state often report news days or weeks after an event takes place.
Flood prone country
There was no indication the North would need outside help to deal with the flooding.
In 2007, the government did seek outside assistance to cope with its most severe flooding in decades. At least 600 people were dead or missing and more than 100,000 homeless after those floods, which destroyed more than 11 per cent of the country's crops.
North Korea is prone to floods and landslides due to poor drainage systems and massive deforestation after a famine in the 1990s that is believed to have killed as many as two million people.
The impoverished country has relied on foreign aid to feed its 24 million people since its economy was devastated by natural disasters and mismanagement in the 1990s.