Here are the standard options:
Format the cells as Zip Codes.....
From the Excel main menu:
<format><cells><number tab>
Category: Special
Type: (select the appropriate zip code format)
OR
Format the cells as Text....
From the Excel main menu:
<format><cells><number tab>
Category: Text
OR
Start each zip code entry with an apostrophe
Example: '00123
which will display as 00123
Does that help?
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Regards,
Ron
XL2002, WinXP