person from outside the prefecture; non-local
Colloquial term used to refer to someone who is not from the speaker's prefecture. Often carries a slight insider/outsider nuance.
Even people from outside the prefecture can participate in this event.
He's from out of the prefecture, so he doesn't know much about the local area.
地元民 means a local person, often used in contrast to 県外人 or other outsiders.
Compound of 県外 (outside the prefecture) + 人 (person).