The boyband's debut American single 'Glad You Came' has sold over a million copies in the US since its release two months ago.
The group were performing a set as part of their radio tour to promote the single when they were handed a plaque to mark the achievement.
After being handed the award, Nathan Sykes told the crowd: "Thank you so much. Thank you to the label as well and every one who's worked on this out here.
"They're the reason this has gone so well, and you guys as well."
'Glad You Came' has peaked at number three on the US Hot 100 and topped the UK chart last summer.
The Wanted recently confirmed that their new single 'Chasing The Sun' - which has been produced by Example - will be released on April 17.
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Watch The Wanted receive their plaque to mark a million US sales of 'Glad You Came' below: