Postcards, a classic way to send a brief message, come in a variety of sizes. But with such diversity, a common question arises: what size postcard can you use a postcard stamp? This article explores postcard sizes, stamp requirements, and simplifies the process for you.

Understanding postcard sizes and their corresponding postage is essential for ensuring your message arrives without extra charges or disappointments. Let's delve into the specifications and guidelines that will help you choose the perfect size and ensure your postcard reaches its destination safely.

Understanding Postcard Sizes
Postcards range from the standard size to oversized jumbo cards, each with its unique dimensions and postage requirements.

The United States Postal Service (USPS) classifies postcards into three main sizes:
- Standard Postcard (3.5" x 5") - This size is widely accepted by postal services worldwide, making it an ideal choice for international correspondence.
- Oversized Postcard (4.25" x 6" or larger) - Postcards larger than the standard size, often called Double Postcards, require additional postage.
- Jumbo Postcard (9" x 12" or larger) - These extra-large postcards are classified as First Class Packages or Flat Rate Envelopes and may require special postage.

Standard Postcard Size (3.5" x 5")
The standard postcard size is perfect for local and international use. It's dimensionally sturdier than typical greeting cards, allowing for more design space and capabilities.
For standard-sized postcards, USPS offers a departamento postcard stamp, which is currently 0.40c. Besides mailing domestically, these stamps can be used internationally, with some countries requiring additional postage.
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Oversized and Jumbo Postcards
Oversized and jumbo postcards add a unique touch to your correspondence but come with additional postage requirements.
For oversized postcards, USPS charges an extra 0.01c for each inch over the standard size, up to a maximum of 13" x 15". Jumbo postcards, on the other hand, fall under First Class Package rates or Flat Rate Envelope prices, depending on their dimensions and weight.

Postcard Stamps for Different Sizes
To ensure your postcard arrives at its destination, select the correct stamp based on its size and destination country.






| Postcard Size | Postage Stamp | Destination |
|---|---|---|
| Standard (3.5" x 5") | Departmento Postcard Stamp (0.40c) | Domestic & select international |
| Oversized (4.25" x 6" - 13" x 15") | Extra Stamp (0.01c per inch) + Dept. Postcard Stamp | Domestic |
| Jumbo (9" x 12" - 11.5" x 13.75") | First Class Package or Flat Rate Envelope | Domestic |
| International | International Postcard stamps (varied rates) | International |
International Postcards
Sending postcards internationally requires knowledge of the destination country's postal policies. Some countries accept standard postcard stamps, while others require additional postage.
To ensure successful delivery, research your destination's postal requirements or use international postcard stamps, which vary in rate and are available at post offices or online.
Embracing the art of postcards begins with understanding their sizes and postage requirements. By following this guide, you'll master the craft of sending postcards, whether domestically or internationally, and express your creativity and thoughts with confidence.