Market Research company Kantar WorldPanel’s latest numbers for the US market shows Windows Phone is finally making some gains in USA.

This morning’s numbers are only looking at the US market, and shows Windows Phone now has 3.2% market share, ie one out of every 31 phones sold runs Windows Phone. Â This number could of course be a lot better, but is significant growth over the 2.1% market share from a year ago, and is even up on the Q4 numbers from last month, when Windows Phone held 2.6% market share in the US on the 12 weeks ending December 2012.

The numbers also show more than 3 times as many Windows Phones as Blackberry handsets are sold, a continuing downward trend for that company.

Kantar also broke the numbers down by carrier, releasing details for Verizon and AT&T.

As can be seen from the numbers AT&T is Windows Phone’s strongest carrier, with 4.3% market share – a share which is growing faster than iOS or Android. Â While IÂ don’tÂ think iOS has anything to worry about on that carrier, I think Android could be at risk from a real competitor over the next year, with close to 1 Windows Phone being sold for each 5 Android handsets.

On Verizon the situation is not that good, with a much more even split between iOS and Android, but Windows Phone sales are certainly much improved from a year ago, when the OS only had 0.2% market share, vs 2.5% now.

We will wait to see what the response of the market to Blackberry 10 is, but if it will be anything like UK I think it is clear Windows Phone is now de facto the 3rd ecosystem in USA.

See Kantar’s USA numbers here.

Thanks Arun for the tip.