List of Billboard Adult Contemporary number ones of 2005

Clarkson won the first season of TV's American Idol in 2002[4] and quickly achieved a number of major pop hits.

[5] Another lengthy run at number one began in the issue of Billboard dated August 20, when "Lonely No More" by Rob Thomas reached the top spot.

Taken from the first solo album by Thomas, the lead singer of the band Matchbox Twenty,[6] the song went on to spend 17 consecutive weeks atop the chart.

Unusually for an AC chart-topper, the song also reached number one on Billboard's Hot Dance Club Play chart thanks to remixes from producers such as Jason Nevins and the Scumfrog.

Locke would achieve further Christmas-themed AC number ones in each of the subsequent two Decembers,[9] part of a trend of festive songs topping the AC listing which began in the early 21st century, when stations of the relevant format began devoting their playlists exclusively to seasonal songs in December.

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Kelly Clarkson 's " Breakaway " spent 20 consecutive weeks at number one.
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Rob Thomas had a 17-week run at number one with " Lonely No More ".
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Michael Bublé topped the chart with " Home ".
American Chicano rock power trio band Los Lonely Boys topped the chart for eight weeks with " Heaven ".
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Kimberley Locke ended the year at number one with her version of the Christmas song " Up on the House Top ".