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The usual pattern is that a concentration camp was built a bit 'into the woods' and then named after the nearest town, village or geographical feature. (One exception may be "Arbeitsdorf", ie: 'labour village'.)
For Jadovno it is the exact same thing.
Jadovno is situated in the former županija Lika-Krbava (County). Which is and was quite thinly settled.
Serbian Wikipedia states that the camp "was built in the hamlet of Jadovno."
As such it existed on k.u.k. Hungarian maps, like this one from 1890:
zoomed:
Jadovno belongs to Trnovac, and that unit's population development was as follows:
1869 | 1931 | 1948 | 2011 |
---|---|---|---|
1.051 | 690 | 612 | 96 |