Nintendo sold 436,000 units in the month, while Sony's PlayStation 2 claimed the second position with 299,000 units. Microsoft's Xbox 360 came in third with 294,000 units and the PlayStation 3 sold 244,000 units.
David Riley, senior marketing manager at NPD, told vnunet.com that all three console makers performed well.
But Nintendo outsold its competitors because it offered a more innovative product that is easy to use and set up and featured strong game titles at launch.
The Wii also sells at a better price point and did not suffer from limited availability as with the PS3, Riley added.
Nintendo's console retails in the US for $250, compared to $300 and $400 for two versions of the Xbox 360, and $500 and $600 for the two PlayStation 3 models.
Microsoft launched its Xbox 360 in 2005. Both Nintendo and Sony started shipping their latest consoles last November.
- Review: Nintendo Wii
- Review: Microsoft Xbox 360
- Review: Sony PlayStation 3
- Review: Sony PlayStation 2
Cotton seedling freezes to death as Chang'e-4 shuts down for the Moon's 14-day lunar night
Fortnite easily out-earns PUBG, Assassin's Creed Odyssey and Red Dead Redemption 2 in 2018
Meteor showers as a service will be visible for about 100 kilometres in all directions
Saturn's rings only formed in the past 100 million years, suggests analysis of Cassini space probe data
New findings contradict conventional belief that Saturn's rings were formed along with the planet about 4.5 billion years ago