Posting a Postcard Properly
The USPS postcard rate has held steady at 28 cents for quite a while now, but the actual cost depends entirely on whether your mailpiece qualifies as a flat or a card. That distinction matters more than most people realize. A postcard stamped at the standard letter rate gets returned or reclassified. I learned this the hard way after mailing about four hundred holiday cards in 2022. The postal worker flagged three of them as oversize because I had cut the edges and rounded the corners. The remaining ones went through fine. Since then I measure every piece before it leaves my desk. The current postcard rate is twenty-eight cents as of the January 2024 price change. The first-class letter rate climbed to sixty-seven cents during the same cycle. The gap between those two numbers is significant if you are mailing anything that isn't a true postcard. You need to understand the dimensional requirements before you slap a stamp on anything. A USPS postcard must meet specific criteria. It has to be rectangular. The thickness cannot exceed one-eighth of an inch. The length has to fall between 3.5 and 4.25 inches and the height between 5 and 6 inches. If your piece goes beyond those measurements by even a fraction, it becomes a flat and you owe the letter rate. Rounded corners count too. They push the piece out of the strict rectangular definition. This rule is enforced more strictly at bulk mail entrances than at your local drop box, which is worth knowing if you run a small batch through the business mail entry system.
Here is the practical side that nobody mentions. A postcard with a printed border that extends to the very edge of the card, then scored and folded along the perimeter, can still qualify as a card if it lays flat. I tested this with several vendors who supply pre-printed postcards. Some of them fold slightly thicker than one-eighth inch after scoring. Those get reclassified as flats. You can check thickness with a simple caliper or even a micrometer if you have access to one. The threshold is real and it is enforced. Permanent Mailer accounts and postage meters complicate things slightly. When you print postage through a meter like Metron or a Digital Postage System, the software calculates the rate based on weight and dimensions you input. If you enter the wrong classification, you underpay and the mail gets returned or extra postage is demanded. There is no middle ground. I once submitted a batch of 150 postcards through a meter and the machine applied the letter rate automatically because I had selected flat instead of card in the job setup. The correction took twenty minutes and delayed the whole batch by a day. Always verify the rate the meter displays before you print and cut the labels. Another detail that trips people up involves weight. Postcards over one ounce move into the first-class letter pricing tier. A standard blank postcard from a supplier like ULINE or PaperPapa weighs roughly 0.3 to 0.4 ounces empty. Once you add ink and any embellishments, you can easily cross the one-ounce threshold. Weigh a sample before you commit to a run. A postal scale that reads to the hundredth of an ounce costs about fifteen dollars online and saves you from surprises at the counter.
Stamped postcards purchased directly from USPS carry a slight premium compared to applying a stamp yourself. The USPS Stamped Postcard product runs around thirty-one cents each when bought in quantity through their online store. That includes the stamp printed on the card. If you buy the card stock separately and apply Forever stamps, you pay twenty-eight cents plus the cost of the card itself. The Forever stamp is always worth the face value regardless of future rate changes, so buying stamps in bulk locks in your cost. I keep a roll of Forever stamps in my office drawer and apply them with a standard adhesive or glue stick. One counter-intuitive thing about postcard mailing is the orientation rule. The address side must face up when deposited. The return address goes on the front, upper left. The message and artwork belong on the reverse. This seems obvious until you mail a batch where half the cards are oriented incorrectly. The automated sorting equipment reads the address side first. Misaligned pieces cause delays and occasional misrouted mail. I learned this from experience when a vendor I was working with sent me half a batch upside down and I didn't notice until the mailpiece count didn't match my records. There are also discounts available through USPS Marketing Mail and Periodicals for qualifying bulk shipments. Those programs operate on completely different rate structures and require pre-sorting, barcoding, and specific documentation. A single postcard or a small batch does not qualify. The Minimum Entry Requirements for Marketing Mail start at five hundred pieces for most product classes. If you are below that threshold you are paying standard first-class rates regardless of volume. I worked with a nonprofit that thought they qualified for bulk rates because they mailed eight hundred postcards a month consistently. They were wrong. They qualified for Commercial Standard rates only after they met the additional barcoding and presort requirements, which added about forty-five minutes of labor per shipment.
Get the Full Details
The biggest mistake I see people make is assuming that any rectangular piece of cardstock qualifies as a postcard for postage purposes. It does not. The thickness rule is the killer. A standard 16-point cardstock exceeds the one-eighth inch limit when folded or layered. Use 12-point or lighter if you want to stay in the postcard rate band. This is a detail that does not appear on the USPS website in a way that is easy to find. You have to know to look for it in the Postal Explorer tables under First-Class Mail Postcards. If you are mailing internationally, the postcard rate is completely different and usually higher. The international postcard rate sits at forty-four cents as of the same 2024 change. Many destinations require additional services or have different dimensional thresholds. Check the specific country guide before you commit to a design. For most people mailing locally or domestically, the straightforward answer is twenty-eight cents per postcard using a Forever stamp, provided the piece meets the dimensional and thickness requirements. Measure a sample. Weigh it. Verify the classification in your meter or at the counter. Do that once and you will avoid the reclassification fees and delays that slow down everyone else.
