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Counties with more registered voters than 18+ population, with % of registered voters who actually voted, and % of 18+ population who actually voted:

.......................% of Reg'd--% of 18+Pop.
.......................that Voted--that Voted
Bennett..................67.9-------70.8
Campbell...............67.9-------73.1
Dewey...................55.7-------63.0
Haakon.................73.5-------74.6
Hand.....................78.0-------83.6
Hanson..................73.4-------83.9
Harding..................82.7-------86.6
Jackson..................62.1-------62.7
Mellette..................63.1-------66.3
Shannon.................44.6-------45.6
Sully.......................80.0-------81.1
Ziebach..................60.9-------65.2
Avg these Counties..62.4-------66.1
STATEWIDE.........70.9-------61.1

So in these counties, turnout of registered voters was 8.5% lower than the statewide average (suggesting these are stale voter rolls, and the dead and otherwise departed registrants aren't voting). However, the turnout of the 18+ population was 5.0% HIGHER than the statewide average (I'll let someone else try to figure out why that might be). Weird, but I don't see any indication that no-longer-valid or never-valid registrations are being used to increase the number of votes cast.