Can i mail an index card as a postcard

What a creative idea!

In general, the United States Postal Service (USPS) allows you to send a postcard as long as it meets certain requirements. Here are the key criteria:

  1. Size: The postcard must be at least 3.5 inches high x 5 inches long x 0.007 inch thick (89 mm x 127 mm x 0.18 mm).
  2. Weight: The postcard must weigh no more than 1 ounce (28.35 grams).
  3. Content: The postcard must have a message or image on one side (the "address side" is usually the side with the recipient's address).
  4. Address: The postcard must have a valid mailing address on the address side.

Now, about your index card:

So, to answer your question: Yes, you can mail an index card as a postcard! Just make sure to follow the USPS guidelines and add a valid mailing address on the address side.

Keep in mind that the USPS may not always deliver index cards as quickly as regular postcards, as they may be treated as a letter or a package. However, they should still be delivered to the recipient's mailbox.

Have fun sending your index card postcard!