OK, fair question.  I finally got around to calling the state DOC and got the numbers.
In FY 2017 Alaska booked 29,489 adults.  Now some of those were repeat bookings in FY2017.
17,571 different individuals were booked into Alaskan adult correctional facilities in FY 2017.

25% of the population is under 18 and 10% is over 65.