It seems to be one of the biggest prison in the country, Bergen can house 258 inmates but it's not clear that there are bigger prisons, trawling through the official listing[0] and looking for "insette" (inducted/inmates) and "plasser" (places/seats) most prisons units are in the high 60s, with very few approaching 200.

[0] http://www.kriminalomsorgen.no/finn-fengsel.237849.no.html