The last four digits of a nine digit ZIP code are changed to zero when merging in Microsoft Word.
Save the file in CSV format before merging it in Microsoft Word:
1. With the file open, click File, Save As from the menu bar. 2. In the Save as type field, select CSV(Comma Delimited)(*.csv). 3. Click OK. 4. If a message appears stating that the file format is not compatible with some features, click Yes to save it anyway. 5. Merge the file in Word.