Semi-finals
The semi-finals began on February 20, with the names announced on February 14. There will be three shows each week for the three weeks of the semi-finals.
There are no format changes from season 4 and 5. The semi-finals featured the contestants (24 total) divided by gender with the 12 male singers singing on Tuesdays and the 12 female singers on Wednesdays. Each person had the chance to select a song to sing live in front of the judges. Following the show's airing, each U.S. timezone would have two hours to vote by phone or by text-messaging. On Thursday, the two of each group with the lowest amount of votes were eliminated each week until the finals.

The 24 semi-finalists, announced February 14, 2007, were:

Females
Alaina Alexander
Antonella Barba
Melinda Doolittle
Stephanie Edwards
Gina Glocksen
Leslie Hunt
LaKisha Jones
Haley Scarnato
Sabrina Sloan
Jordin Sparks
Nicole Tranquillo(Eliminated February 22, 2007)
Amy Krebs (Eliminated February 22, 2007)

Males
A.J. Tabaldo
PhilStacey
Chris Sligh
Brandon Rogers
Chris Richardson
Nicholas Pedro
Sanjaya Malakar
Blake Lewis
Sundance Head
Jared Cotter
Paul Kim (Eliminated February 22, 2007)
Rudy Cárdenas(Eliminated February 22, 2007)