User blog comment:TDIwriter/Two Years of TDIwriter/@comment-1153194-20110219225420/@comment-3037915-20110220232751

We woudn't know their race unless it's obviously said by the writers or in the show.

Katie and Sadie and Noah are totally unknown.

Alejandro's being Spanish is pretty obvious, as he said it over a trillon times in S3.

Heather's being Asian was said by the producers.

Courtney's being Hispanic came from I-don't-know-where, but others say it was from the producers.

Leshawna's being African came from I-don't-know-where as well.

DJ's being Jamaican was on the show once and his profile, I think.

I never thought Justin would be Hawaiian, but it TK comfirmed it, ok.

Katie, Sadie, and Noah are unknown until mentioned. Plus they might never be, as some of them (Noah) have no reason too while others (Al) do. Ask the producers, and see if they respond sometime.