Date Meets ZIP Calendar
Once a century, for some post offices, the date and the ZIP Code of a postmark will match. For instance, on 5/31/19, a postmark from Eagle, Wisconsin, 53119 features a matching date and zip. Gathering these postmarks is a pursuit of some collectors.
Use the calendar below to find the matching pairs through the end of 2020. Click any entry to show the post office's mailing address to request your postmarks!