Assuming you mean in the numbers 1, 2, 3, ..., 998, 999, 1000 then the digit 0.
(The digit 1 appears 301 times, the digits 2-9 all appear 300 times each, but the digit 0 only appears 192 times.)
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Zero (192 occurances), then 2 to 9 (all equal at 300), and then 1 (301).
The 6
-999999
10
Four. (100 x 10 = 1,000)