ZIP Codes or postal codes needs to be formatted as text to preserve the data during a mail merge. Format a column of percentages as text if you want to avoid that multiplication factor. If you choose percentage as a category, be aware that the percentage format will multiply the cell value by 100. Format a column with numbers, for example, to match a specific category such as currency.
In your Excel data source that you'll use for a mailing list in a Word mail merge, make sure you format columns of numeric data correctly. Save your spreadsheet with a new file name. Data is imported beginning with the named cell address. Caution: The cell address in the Import Data dialog box shows the currently selected cell.
