Do Postcards Need Stamps? Mailing Rules Explained

Quick Answer: Yes, Postcards Need Stamps

Do postcards need stamps? Absolutely. Every postcard sent through USPS requires postage. Standard postcards (no larger than 6" x 4.25") qualify for the postcard rate, which is cheaper than a First-Class letter stamp. Oversized postcards cost more. 4OVER4 has printed 10 billion+ cards for 150,000+ businesses, and every single one that went through the mail needed proper postage to reach its destination.

Mailing Postcards: What You Need to Know Before You Send

Postcards are one of the most cost-effective ways to reach customers, promote events, or stay in touch. But before you drop a stack at the post office, you need to understand how postage works. The short version: do postcards need stamps? Yes. Always. No exceptions when using USPS.

The good news is that postcard stamps cost less than regular letter stamps. And if you're sending in bulk, you can save even more through presorted mail rates. Whether you're mailing 50 postcards or 50,000, getting the postage right saves you money and headaches.

4OVER4 makes it easy to go from design to mailbox. Browse our Design Templates to get started fast. Need help with your order? Visit our Help Center. You can also Earn Coins on every purchase and redeem them for free products later.

Postcards

Starting from $16.48

Free Design Templates:

How Postcard Postage Works: Rates, Sizes, and Mailing Rules

Postcard postage isn't complicated once you know the rules. USPS has specific size and thickness requirements that determine whether your mail piece qualifies for the lower postcard rate or gets bumped up to letter rate. Let's break it all down so you can mail postcards without overpaying or getting returns.

USPS Postcard Size Requirements for the Postcard Stamp Rate

To qualify for the USPS postcard rate, your postcard must meet these dimensions:

• Minimum size: 5" long x 3.5" high
• Maximum size: 6" long x 4.25" high
• Thickness: Between 0.007" and 0.016"
• Shape: Rectangular with a length-to-height ratio between 1.3 and 2.5

If your postcard falls within these specs, you pay the postcard rate. Go even slightly over on any dimension, and USPS classifies it as a letter. That means higher postage. A 6.25" x 4.5" postcard? That's a letter now. Plan your print size with this in mind.

For more details on USPS mailing standards, visit the

For design files that meet postal requirements from the start, download our Blank Templates. They're pre-sized with bleed and trim marks already in place.

Blank Templates

3D Lenticular Postcards Black Postcards

Current Postcard Stamp Rates

As of 2025, the USPS postcard rate is $0.56 for a single domestic postcard. A First-Class letter stamp costs $0.73. That's a $0.17 difference per piece. Mail 1,000 postcards and you're saving $170 just by keeping your card within postcard dimensions.

For bulk mailers, USPS Marketing Mail (formerly Standard Mail) offers even lower rates. Presorted postcards can drop to around $0.30-$0.40 per piece depending on volume, sorting level, and destination. You'll need a USPS Marketing Mail permit and a minimum of 200 pieces or 50 pounds per mailing.

How to Send Postcards Through USPS: Step by Step

Learning how to send postcards is straightforward. Here's the process:

1. Design your postcard. Include your message, imagery, and branding on the front. Leave the back formatted for the mailing address, return address, and postage area.
2. Print your postcards. 4OVER4 offers postcards on premium paper stocks with multiple finish options. Your card stock needs to be rigid enough to meet USPS thickness requirements.
3. Address each postcard. The delivery address goes on the right side of the back. Handwritten or printed - both work.
4. Add postage. Affix a postcard stamp or use a postage meter. For bulk mailings, apply indicia (the printed postage mark) instead of individual stamps.
5. Drop off or schedule pickup. Take your postcards to the post office, drop them in a blue collection box, or schedule a USPS pickup from your location.

If you're creating other marketing materials alongside your postcards, check out our guide on How To Make Flyers for complementary print pieces.

Do Postcards Need a Return Address?

Here's a question that comes up a lot: do postcards need a return address? Technically, USPS does not require a return address on postcards. Unlike letters and packages, postcards can be mailed without one.

But should you include a return address? Yes. Here's why:

• Undeliverable mail comes back to you instead of disappearing into the dead letter office
• It looks more professional and builds trust with recipients
• Bulk mail permits require it - if you're using Marketing Mail rates, a return address is mandatory
• It reinforces your brand - another touchpoint with your business name and address

For business postcards, always include your return address. It's free branding real estate. Visit our Faq Hub for more tips on formatting your mail pieces correctly.

How to Mail Postcards in Bulk

Bulk mailing is where postcards really shine as a marketing tool. Here's how to mail postcards at scale and keep costs down:

USPS Marketing Mail is the go-to for bulk postcard campaigns. You'll need a mailing permit (one-time fee of around $275) plus an annual mailing fee. In exchange, you get access to rates well below the single-piece postcard price.

Your mailing list needs to be clean. Run it through USPS's CASS (Coding Accuracy Support System) certification to verify addresses. Bad addresses mean wasted postage and lower delivery rates.

Sort your postcards by ZIP code. The more sorting work you do, the cheaper the rate. USPS rewards mailers who pre-sort because it reduces their processing time. Five-digit presort gets you the best rates.

"We switched from email blasts to 4OVER4 Postcards for our quarterly promotions. Response rates jumped from 2% to nearly 8%. The postcard stamp cost pays for itself ten times over."

- Marcus L., restaurant owner

4OVER4 also offers Direct Mail Postcards with EDDM (Every Door Direct Mail) options. EDDM lets you target entire carrier routes without needing a mailing list. You pick the neighborhoods, and USPS delivers to every address on that route.

Direct Mail Postcards

Starting from $89.68

Premium Direct Mail Postcards Ready to Print

Free Design Templates:

Postcard Formatting Rules for Mailing

Getting the format right matters. USPS has specific layout requirements for the address side of your postcard:

• Right half: Reserved for the delivery address, postage, and barcode clear zone
• Left half: Available for your message, return address, or additional graphics
• Barcode clear zone: A 4.75" x 0.625" area at the bottom of the address side must stay clear for the Intelligent Mail barcode
• Postage area: Upper right corner, at least 1" x 1.5" clear space

If you're working with envelopes for other mailings, our guide on How To Make Envelopes covers proper formatting. And for brochures that might accompany your postcard campaigns, see How To Fold A Brochure.

Alternatives to Traditional Stamps

You don't have to lick and stick individual stamps onto every postcard. Here are your options:

Postage meters print postage directly onto your postcards or onto adhesive labels. They're ideal for offices that send mail regularly. Meters give you exact postage amounts, so you never overpay.

Online postage services like Stamps.com or Pitney Bowes let you print USPS postage from your desk. Some offer discounted rates compared to retail pricing.

Precanceled stamps are available for bulk mailers. You buy them in bulk at a discount and apply them before mailing.

Permit imprints (indicia) are the most common method for large mailings. Instead of a stamp, a printed marking on the postcard shows postage has been paid. This is what you'll use with USPS Marketing Mail.

For other creative marketing materials that don't require postage at all, explore how to create Custom Magnets Faq for hand-delivered promotions. And if you use rubber stamps for branding your mail pieces, here's how to keep them in top shape: How To Clean Rubber Stamps.

International Postcard Postage

Sending postcards internationally? The rules change. As of 2025, an international postcard stamp costs $1.65 through USPS. That's the same rate as an international letter, so there's no size-based discount for international postcards.

Size limits for international postcards are slightly different too. Maximum dimensions are 9.25" x 6.25", and minimum is the same 5" x 3.5" as domestic. Thickness must be between 0.007" and 0.016".

Delivery times vary widely. Canada and Mexico typically take 7-10 business days. Europe runs 10-14 days. Asia and other destinations can take 2-4 weeks. There's no tracking on standard international postcards, so plan your send dates accordingly.

Below you'll find industry data on postcard marketing effectiveness, real customer showcase examples, and ready-to-use templates to get your postcards designed and printed fast.

Postcard Mailing Mistakes That Cost You Money

These errors trip up even experienced mailers. Avoid them and your postcards will arrive on time, every time.

• Oversized cards at postcard rates. Your 6.5" x 4.5" postcard won't qualify for the postcard stamp. It gets charged as a letter. Measure before you print.
• Skipping the barcode clear zone. Text or graphics in the bottom barcode area can cause processing delays or returns. Keep that space empty.
• Flimsy card stock. If your postcard is too thin (under 0.007"), USPS may reject it. 4OVER4 prints on stocks that meet postal thickness requirements.
• No return address on bulk mail. Single postcards don't technically need one. But USPS Marketing Mail requires a return address. Skip it and your entire mailing gets rejected.
• Dirty mailing lists. Outdated addresses mean wasted postage. Run your list through NCOA (National Change of Address) before every mailing.
• Putting postage in the wrong spot. Stamps and indicia go in the upper right corner. Anywhere else causes processing errors.

Getting the details right on your postcard design and mailing setup saves real money at scale. Don't learn these lessons the expensive way.

Postcards Built for the Mailbox

Now that you know postcards need stamps and how to mail them properly, you need postcards worth stamping. 4OVER4 prints Postcards on rigid, mail-ready card stocks that meet USPS thickness requirements right out of the box.

Want something that really stands out in the mailbox? Try 3D Postcards with lenticular printing that creates motion and depth. Recipients don't throw those away.

Here are the available postcard products, pricing options, and detailed specs to help you choose:

Free Design Templates

Real Estate postcardReal Estate Agent Postcard

Your Postcard Mailing Questions, Answered

Do postcards need stamps to be mailed through USPS?

Yes, postcards need stamps or some form of postage to be delivered by USPS. A standard postcard stamp costs $0.56 as of 2025. Bulk mailers can use permit imprints or metered postage instead of physical stamps, but postage is always required.

What size does a postcard need to be for the cheaper stamp rate?

Your postcard must be between 5" x 3.5" (minimum) and 6" x 4.25" (maximum) to qualify for the USPS postcard rate. Anything larger gets classified as a letter and costs $0.73 instead of $0.56. Thickness must fall between 0.007" and 0.016".

Do postcards need a return address to be mailed?

USPS doesn't require a return address on individual postcards. However, bulk mailings through USPS Marketing Mail do require one. Even for single postcards, adding a return address is smart. Undeliverable cards come back to you instead of getting lost.

How do I send postcards in bulk without using individual stamps?

Apply for a USPS Marketing Mail permit and use permit imprints (indicia) instead of stamps. You'll need a minimum of 200 pieces per mailing. Presort by ZIP code for the lowest rates. This is the standard method for how to mail postcards at scale for marketing campaigns.

Can I use a regular Forever stamp on a postcard?

Yes, you can use a Forever stamp on a postcard. It works fine, but you'll overpay. A Forever stamp covers $0.73 in postage, while a postcard stamp is only $0.56. Over large quantities, that $0.17 difference adds up fast.

How long does it take for a stamped postcard to arrive?

Domestic postcards with a postcard stamp typically arrive in 2-5 business days through First-Class Mail. Marketing Mail (bulk rate) takes 3-10 business days. International postcards can take 1-4 weeks depending on the destination country.

What happens if I mail an oversized postcard with a postcard stamp?

USPS will return it to you marked "postage due" if you included a return address. Without a return address, it may be delivered with postage due charged to the recipient, or it could end up undelivered. Always match your postage to your postcard size.

Still have questions about how to send postcards or get your order started? Visit the 4OVER4 Help Center for direct support from our team.