Put this in C1 and drag down 1200 rows (same as column A's length):

=isnumber(match(a1,b:b,0))

You'll see True if there's a match and False if there is no match.

WPAUMAN wrote:

Col A has 1200 cells, col b has 1600 cells. How do I find cells from col A
that are NOT in col B?

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Dave Peterson