If you're starting new, when you get to the end of character creation the list of servers seems to be in order of population. The lower populated ones being near the top(1 chocobo) and the highest at the bottom(3 chocobos). Last I looked Selbina, Gysahl, Mysidia, Figaro....and 1 other(Cornelia maybe?) had the 3 chocobos at the bottom of the list.
Most of 'em are in the middle area, Trabia was in that pack I think.