Question
What are the USPS mailing limitations for postcards?
Answer
USPS sorts mail into size bands, and those bands decide whether a card mails at the lower postcard rate or at letter and flat rates. Staying inside the postcard dimensions keeps postage cheaper, while going larger buys more space at a higher rate.
| Card size | Typical USPS class |
|---|---|
| 3.5 x 5 up to 4.25 x 6 in | Postcard rate (lowest) |
| Larger, up to 6.125 x 11.5 in | Letter rate |
| Beyond letter limits | Flat or large-envelope rate |
- A popular size like 4 x 6 qualifies for postcard rates.
- Sizes such as 5 x 7 or 6 x 9 usually mail at letter or flat rates.
- Confirm current dimensions and rates with USPS before a large mailing.
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