The smallest Freeports have about 80 or so. Those Freeports appear to be smaller than the Juggernaught - just park your Juggernaught next door - and a lot of the space is taken up by docking bays and whatnot. I'd say the Juggernaught would have about 500 to 900 permanent residents, who would also crew the thing (anyone living on a Freeport is there to help run the Freeport, I think. No retired folks here. That's what GC is for. So the same likely goes for a Juggernaught).
I'd say the Juggernaught would carry a few fighters along with it. Does it have a docking port?
