You might encounter problems with US Postal Codes when entered into Excel. The standard format is 5 digits XXXXX. Being such, there areas that starts with Zero, 0XXXX. The same goes with the additional 4 digits, XXXX-NNNN. NNNN could take in Zero as the first digit, 0NNN.
This issue could lead to a Postal Code of only four digits and the extension with only three digits.
=IF(Len(J2)=4, “0”&IF(LEN(K2)=3,J2&”-0″&K2,J2&”-“&K2), IF(LEN(K2)=3,J2&”-0″&K2,J2&”-“&K2))
Then format the column as text.