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The sixth digit of the NAICS code is used to define national industries
check digit
Digit Check
the answer is 1010 the 1st digit is 1 x 8 = 8 the 2nd digit is 0 x 4 = 0 the 3rd digit is 1 x 2 = 2 the 4th digit is 0x 1 =0 i hope this helps
ZIP Code began on July 1, 1963,