It looks like any blank corner should work for a stamp on a postcard. There is no envelope hiding the layout, after all. USPS sorting equipment disagrees, and it scans a specific zone for postage on every card that passes through.
Put the stamp on a postcard in the wrong spot and a machine sometimes cannot read it. That pushes the card into manual handling instead of automated sorting. Here is exactly where a stamp on a postcard belongs and why the layout works that way.
Where the stamp on a postcard goes
The stamp belongs in the top right corner of the address side. Aim for roughly one inch down from the top edge and one inch in from the right edge. That is the same corner USPS expects postage in on a standard envelope.
The address side is whichever side is left blank for writing, not the side carrying the photo or artwork. On most printed postcards, small guide lines or a stamp box mark the exact spot.
The divided back layout, explained
USPS has allowed a divided back on postcards since 1907. That layout splits the blank side into two zones.
The left half holds a short written message. The right half holds the address plus the stamp in its top corner.
That split is why the picture usually covers the entire front of a modern postcard. Before 1907, part of the front had to be reserved for a message instead. A full photo simply did not fit.
Why placement affects machine readability
Automated sorting equipment scans the top right zone of the address side first. It looks for valid postage before it reads the address below.
A stamp on a postcard placed outside that zone can confuse the scan. The card is still technically valid mail, just slower to process.
USPS also expects clear space below the address block for a printed barcode added during processing. Crowding that space with stickers or oversized handwriting can slow the automated read. The USPS Quick Service Guide for mailpiece design lays out this layout in more detail.
Common mistakes when placing a stamp on a postcard
Putting the stamp on the picture side instead of the address side is the most common error. It was actually standard practice among stamp collectors a century ago, for what collectors call maximum cards. Today it just confuses a modern sorting machine and risks a manual sort.
Overlapping the stamp with the address text is another frequent problem, especially on smaller cards with large handwriting. Square or non rectangular cards create a separate issue entirely. USPS treats those shapes as nonmachinable and adds a surcharge no matter where the stamp sits.
- Stamp on the picture side instead of the address side
- Stamp overlapping the recipient address or barcode clear zone
- A letter rate stamp used where the card actually needs a postcard rate stamp
- Square, round, or irregularly shaped cards mailed without the nonmachinable surcharge
What to do if the stamp ends up in the wrong spot
A postcard with a slightly misplaced stamp usually still gets delivered. USPS equipment catches a wide range of placement errors automatically. Real senders in postcard trading communities routinely report odd shaped or unusually stamped cards arriving without issue.
A severely misplaced or hard to read stamp is more likely to trigger a manual sort. That adds time rather than stopping delivery outright.
If you are unsure whether a card needs the surcharge, take it to a Post Office counter instead. Ask for a hand cancel there.
Which stamp actually belongs in that corner
A domestic postcard needs a stamp valued at the current postcard rate, not a stamp priced for a sealed letter. A Forever stamp will still carry the card. It just costs more than the postcard actually needs.
Postcard rate stamps are sold at the Post Office counter and on USPS.com, though not every retailer stocks them. Our guide to stamp retailers covers which stores typically carry the right denomination.
Homemade and photo postcards
Photo postcards printed at a drugstore kiosk or through an online photo service follow the same placement rule as any other card. Check the back for a printed stamp box first, since many photo services already mark the correct corner.
If there is no printed guide, measure roughly an inch from the top and right edges yourself. A postcard trimmed at home from cardstock needs the same care, since an edge that runs too close to the trim line can still confuse a scanner.
Postcard placement vs envelope placement
The logic is identical to a standard envelope. Postage goes in the top right corner of the address side. The return address sits opposite it if there is room.
Our guide to envelope placement rules covers the letter version of the same layout.
The one real difference between the two is the stamp value itself, not the corner it sits in. Both a letter and a postcard follow the same top right rule for where postage goes.
The bottom line
A stamp on a postcard goes in the top right corner of the address side, about an inch from each edge. That is the same zone a sorting machine expects on any envelope.
Keep it clear of the address and the barcode space below it. Use a stamp valued at the actual postcard rate when you can. Pay the nonmachinable surcharge upfront for square or oddly shaped cards.
For the exact postage a specific card needs, run it through our postage tool for stamps before you drop it in the mail.
