Unless you're a Big Star like Miley, you HAVE to be in the state that the agency is in. Miley's dad was a famous country singer during the 1990s so that helped her.

The reason for this is because if your flight or train gets delayed and can't make the audition, then you not only look bad, but you've made your agent look bad in the eyes of the casting directors. The relationship between the agent and casting director is VERY important. If you ruin that relationship by not showing up to the audition then the agent has a good reason to drop you.

The ONLY way you can have an agent ouside of your state, STAR OR NOT, is if it's a Voice Over Agency. With Voice Overs, you can record an MP3 file of your audition at your house or a local recording studio and email it to your agency.