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I see why - the actual confirmed cases are 154 out of a population of 1607. That is 9.583%. If you take 9.583% times 100,000 - you get 9583. They have extrapolated it to 100 thousand so that comparisons with larger population areas will be somewhat consistent per capita... I think.
Not sure why there is a difference in the population numbers unless they used a different census than you did?