Deandre Brackensick, Adam Brock, Eben Franckewitz, Chase Likens, Aaron Marcellus and Jeremy Rosado complete the lineup of male semi-finalists.
Audiences were left in suspense last night wondering whether Brock would make the semi-finals.
> 'American Idol': The Top 24 are revealed: Part 1
One of Jermaine Jones, Richie Law, Johnny Keyer or David Leathers Jr will also be brought back to the competition next week.
Skylar Laine, Hallie Day, Shannon Magrane and Hollie Cavanaugh are added to the list of female semi-finalists.
They join 14 hopefuls who were named on yesterday's show (February 22).
American Idol's live shows get underway next week, with broadcaster Fox scheduling the show on three consecutive nights.
The male semi-finalists will sing live and face the public vote for the first time on Tuesday, February 28 at 8/7c, while the female semi-finalists make their debut on Wednesday, February 29 at 8/7c.
The finalists will be named on Thursday, March 1 at 8/7c.
The Top 24 semi-finalists in full:
- DeAndre Brackensick, aged 17 from San Jose, California
- Adam Brock, aged 27 from Washington, Pennsylvania
- Baylie Brown, aged 22 from Krum, Texas
- Hollie Cavanaugh, aged 18 from McKinney, Texas
- Hallie Day, aged 24 from Baltimore, Maryland
- Colton Dixon, aged 20 from Murfreesboro, Tennessee
- Creighton Fraker, aged 28 from Queens, New York
- Eben Franckewitz, aged 15 from Loveland, Ohio
- Reed Grimm, aged 26 from Ellsworth, Wisconsin
- Heejun Han, aged 22 from Flushing, New York
- Jen Hirsh, aged 25 from Agoura Hills, California
- Haley Johnsen, aged 23 from Beaverton, Oregon
- Skylar Laine, aged 18 from Brandon, Mississippi
- Joshua Ledet, aged 19 from Westlake, Los Angeles
- Chase Likens, aged 21 from Point Pleasant, West Virginia
- Shannon Magrane, aged 16 from Tampa, Florida
- Aaron Marcellus, aged 27 from Atlanta, Georgia
- Phillip Phillips, aged 21 from Leesburg, Georgia
- Jeremy Rosado, aged 19 from Valrico, Florida
- Jessica Sanchez, aged 16 from San Diego, California
- Chelsea Sorrell, aged 23 from Stokesdale, North Carolina
- Elise Testone, aged 28 from Hometown: Charleston, South Carolina
- Erika Van Pelt, aged 26 from South Kingstown, Rhode Island
- Brielle Von Hugel, aged 17 from Staten Island, New York