Addressing Envelope 101
How to read an envelope
The delivery address sits in the center of the envelope and tells you who it was sent to. The return address, in the top left corner, tells you who sent it. The postmark, usually stamped over or near the stamp in the top right, shows where and when it entered the mail system. If you are trying to identify a piece of mail rather than write one, those three blocks, plus any sticker added after the fact, are everything on the front worth reading.
Checked September 28, 2026/7 min read
Written by Claire PostReviewed against USPS Publication 28
What is on this page6 sections
Every envelope you write is an envelope someone else has to read, and most of what is actually on it was never meant for you to compose, it was added by the mail system itself. Reading one back is a different skill than writing one, and it starts in a different place.
Start with the three blocks a sender controls: the delivery address in the center, the return address in the top left, and the postage in the top right. Everything else on the front, the postmark, the barcode strip, any forwarding label or certified mail sticker, was added later by USPS equipment or staff, and each one answers a different question about where the piece has been rather than who it is from or going to.
That distinction matters most when something looks unfamiliar. A name you do not recognize is not automatically a misdelivery, a smudged postmark is not a sign of tampering, and a missing barcode has no bearing on what the letter says inside. Reading an envelope well means knowing which mark answers which question, instead of treating the whole front as one undifferentiated block of information.
Step by step
Find the delivery address in the center
This is who the envelope was sent to, and it is always the largest, most central block of text. Name on the first line, street or box on the next, city/state/ZIP on the last. If a piece of mail is addressed to you but the name is unfamiliar, check whether it is a former resident, a similar name at your address, or a "Current Resident" style address rather than assuming it was misdelivered.
Find the return address in the top left corner
This tells you who sent it. It follows the same three-line structure as the delivery address, just smaller and in the corner. A missing return address is legal on most First-Class Mail, so its absence does not mean anything was hidden, only that whoever sent it skipped an optional step.
A MERCER88 PINE GROVE RDITHACA NY 14850CorrectA standard return address, top left corner. Read the postmark for where and when it was mailed
The postmark is stamped by USPS at the facility that processed the piece, usually as a circular or wavy-line cancellation mark over or beside the stamp. It shows the date and the three-letter or full city/state name of the processing facility, which is not always the same as where the sender actually lives.
Check the bottom strip for the barcode, not for content
The bottom roughly 5/8 inch of the envelope carries a printed barcode USPS adds during sorting. It encodes the delivery ZIP+4 for routing and is not something a person reads. If it is missing or smudged, that only affects sorting speed, not what the letter actually says.
Look for anything added after the original mailing
A yellow forwarding label, a green certified mail card, or a stamped reason like "Vacant" or "Not Deliverable as Addressed" are all added on top of the original address after the fact. They tell you what happened to the piece in transit, separate from what the original sender wrote. See return to sender and undeliverable mail for what each stamped reason means.
Quick reference
| What you see | What it tells you | Where it sits |
|---|---|---|
| Delivery address | Who the mail was sent to | Center of the envelope |
| Return address | Who sent it | Top left corner |
| Stamp or postage meter mark | Postage was paid | Top right corner |
| Postmark | Where and when it entered the mail stream | Over or beside the stamp |
| Barcode strip | Machine-readable routing data | Bottom 5/8 inch, full width |
| Yellow forwarding label | The addressee moved and left a forwarding order | Pasted over the original address |
| Green card or barcode sticker | Certified Mail, tracked and signed for | Left edge or front of envelope |
Special cases
The rule above covers most people. Here is what changes for the rest.
I cannot make out the handwritten name or street on an envelope addressed to me. What now?
Look first at the parts that are usually still legible even in messy handwriting: the ZIP code and city, which narrow things down fast, and the return address, which is often written more carefully than the delivery address since the sender wrote their own information last and more deliberately. If the street number is ambiguous between two digits, cross-check it against mail you already know is correctly addressed to your address.
How do I read a return address that only has a name and no street, like a company or PO Box?
That is a complete, valid return address on its own; a name paired with a PO Box or a company name paired with a suite number is not missing information, it is simply shorter than a full residential address. Treat it the same as any other return address for identifying the sender.
What does it mean if the delivery address is crossed out and a new one is written next to it?
That is usually a carrier or a postal clerk correcting a minor addressing error by hand, often after checking the ZIP+4 database, rather than anything the original sender did. It generally does not change who the mail is legally addressed to.
Can I tell where someone lives just from the postmark?
Not reliably. The postmark shows the processing facility that handled the piece, which is often a regional distribution center rather than the sender town, and increasingly mail is trucked to a centralized facility before postmarking regardless of where it was dropped off. The return address, not the postmark, is the only field meant to identify the sender location.
Key terms on this page
- Postmark
- The stamped mark, showing a date and processing location, applied by USPS when a piece of mail enters the system. It cancels the postage and records when the piece was mailed.
- Indicia
- A printed postage marking, used instead of a physical stamp, common on business and bulk mail. It replaces both the stamp and, often, the postmark in one printed block.
- Delivery point barcode
- The machine-readable barcode printed along the bottom of a scanned envelope, encoding the ZIP+4 and specific delivery point so sorting equipment can route it without a human reading the address.
- Forwarding label
- A sticker, usually yellow, applied over or beside the original address when USPS redirects mail under an active change-of-address order.