The powerful main tremor, followed by hundreds of aftershocks, injured at least 330 people, local authorities said.
Around 30,000 households were without electricity in the Ishikawa region, and 89,800 homes there and in two neighbouring regions had no water.
Hundreds of people were in government shelters.
The Suzu area was also devastated, with fishing boats sunk or lifted like toys onto the shore by tsunami waves that also reportedly swept one person away.
Noriaki Yachi, 79, fought back tears after his wife was pulled from the rubble there and confirmed dead, the Asahi Shimbun daily reported.
“My life with her was a happy one,” Yachi said.
Japan experiences hundreds of earthquakes every year and most cause no damage, with strict building codes in place for more than four decades.
Earthquakes have hit the Noto region with intensifying strength and frequency over the past five years.
The country is haunted by a massive 9.0-magnitude undersea quake in 2011, which triggered a tsunami that left around 18,500 people dead or missing.
It also swamped the Fukushima atomic plant, causing one of the worst nuclear disasters in history.