I don't know where "worldatlas.com" gets their numbers from, but it's not like the underlying data is classified.

According to the Alaska Criminal Justice Commission (you know, the people talking about what a roaring success SB 91 has been), the average daily population at DOC is about 4300 people. With a state population of about 742,000 people, that's an incarceration rate of a little under .58%, as I said above. Or about 580 people per 100,000, if you prefer to look at it that way.