Adding Leading Zeroes to ZIP Codes

When you import ZIP Codes from a text file into an Excel workbook, it is not uncommon for Excel to translate the values as numbers rather than as ZIP Codes. This results in leading zeroes being dropped from the ZIP Codes, which can obviously cause problems later using the data for its intended purpose.

One solution, of course, is to simply change the display format used for ZIP Code cells. This may work for the display, but the underlying data is still missing the leading zeroes. A better solution is to use a macro that goes through and adds leading zeroes to the information in a cell. The following macro does just that:

Sub MakeZIPTxt()
    Dim ThisCell As Range
    Application.ScreenUpdating = False
    'Make sure format is text
    Selection.NumberFormat = "@"
    For Each ThisCell In Selection
        'Strip the leading apostrophe, if any
        If Left(ThisCell, 1) = "'" Then
            ThisCell = Mid(ThisCell, 2, 99)
        End If
        'It's a 5-digit ZIP Code
        If Len(ThisCell) <= 5 Then
            ThisCell = "'" & Right("00000" & ThisCell, 5)
        Else
            ThisCell = "'" & Right("00000" & ThisCell, 10)
        End If
    Next ThisCell
    Application.ScreenUpdating = True
End Sub

To use the macro, simply select the range of cells containing the ZIP Codes, then run the macro. The macro actually changes the cell contents—no longer will the cells contain numeric values (the cause of the original problem), but they will contain text values. This allows the leading zeroes to appear at the beginning of the ZIP Codes.