The search for a new superstar kicked off at the LA Sports Arena on Sunday, where more than 18,000 people and counting had already gathered by 9am.
"There are still people walking through the gates and we're so excited about it," executive producer Rob Wade told DS.
"I don't know what the final figure is, but it's the largest singing audition in LA... That's not bad for a new show, is it?"
Auditions for the Fox competition, which are open to groups and individuals from the age of 12 years old, are held in front of a live audience, with the ultimate prize being a $5 million recording contract with Sony.
Aspiring stars can also audition at Bank United Centre in Miami (April 7), Prudential Centre in Newark (April 14), Key Arena in Seattle (April 20), the Sears Centre Arena in Chicago (April 27) and Dallas Convention Centre, Dallas (May 26).
It was recently confirmed that former Island Def Jam chairman L.A. Reid will join Simon Cowell on the judging panel, with an announcement on the other two judges expected to be made in the coming weeks.
The X Factor premieres on Fox this fall.