You could 'Custom Format' your cell(s) to:
00000
OR,
You could 'Special Format' your cells to:
Zip Code
OR
You could prefix your cell entry with an apostrophe ( ' )
Which is *not* displayed in the cell but can be seen in the formula bar
OR
You could *PRE* format your cells to
TEXT
--
HTH,
RD
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Please keep all correspondence within the Group, so all may benefit!
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Why does Excel not accept a "0" as the first number of a 5 digit zip code?