The standard US mailing address format
A domestic address is read from the bottom up by sorting equipment: the ZIP code routes the piece to a facility, the street line routes it to a carrier, and the name routes it to a person. Write it in this order:
- Recipient name. First and last name, or the attention line for a business delivery.
- Company name (only if the delivery is to a business).
- Street address including house number, directional, street name, street suffix, and the secondary unit at the end of the same line.
- City, state, ZIP. All three on one line, with the two-letter state abbreviation and the five-digit ZIP or ZIP+4.
- Country on its own final line, for international mail only. Never add USA to a domestic piece.
JANE DOE NORTHSIDE COFFEE CO 1234 CONGRESS AVE STE 200 AUSTIN TX 78701
USPS formatting conventions that actually matter
- All capital letters, no punctuation. This is the published postal standard because it produces the cleanest optical read. The only punctuation that stays is the hyphen in a ZIP+4.
- Left align every line. Do not center the block and do not indent the second line.
- No slashes, no ampersands, no extra symbols. Machines treat them as noise.
- Keep the block clear of the label edges and keep barcodes, tape and stickers off it. A barcode printed over the address line is a scan failure waiting to happen.
- One address per side. Old labels from a reused box are one of the fastest ways to misroute a package. Remove or fully black them out.
Standard abbreviations to use
Postal abbreviations are not stylistic preferences. They keep the street line short enough to print without truncation and they match what the address database expects.
| Written out | Standard abbreviation |
|---|---|
| Street / Avenue / Boulevard | ST / AVE / BLVD |
| Road / Drive / Lane / Court | RD / DR / LN / CT |
| Parkway / Highway / Place | PKWY / HWY / PL |
| Apartment / Suite / Unit | APT / STE / UNIT |
| Building / Floor / Room | BLDG / FL / RM |
| North / South / Northwest | N / S / NW |
| Post Office Box | PO BOX |
Secondary unit designators such as APT, STE and UNIT belong at the end of the street line, not on a line of their own underneath. Only when the combined line is too long to fit does the unit move to the line above the street address. The pound sign is accepted but weaker than a spelled designator, because a stray mark next to it can change the number.
Common address mistakes and what they cause
| Mistake | What it causes |
|---|---|
| Missing apartment, suite or unit number | Carrier cannot match a resident, so the package is left in a lobby or returned as an insufficient address |
| Unit number placed after the city | Parsed as part of the city line, sorting delay or return |
| ZIP code that does not match the city | Routed to the wrong sorting facility, then rerouted, adding transit days |
| Directional dropped (N, SW, E) | Delivery attempted on the wrong end of a split street with the same name |
| PO Box given to a private carrier | Undeliverable, because most non-postal carriers cannot deliver to PO Boxes |
| Street address typed into the address line 2 field | Label prints out of order and the street line reads wrong |
| Company name placed on the street line | Line overflows and the suite number gets truncated off the label |
| Old label left on a reused box | Scanner reads the wrong barcode and misroutes the shipment |
Every row above turns into a delivery exception, which is the scan that tells you a package has stopped moving for a reason the carrier cannot fix on its own.
How international addresses differ
- The country goes last, alone, in English. Postal systems on both ends need to read that line, so write GERMANY rather than Deutschland.
- Postal code placement varies. It sits before the city in much of Europe, after the city and province in Canada, and after the state in Australia. Copy the local convention rather than forcing the US pattern.
- Keep the interior lines in the destination format. The origin country only needs to read the last line to get the piece on the right plane.
- Do not abbreviate the country. Spell it out.
ANNA MUELLER MUSTERSTRASSE 12 10115 BERLIN GERMANY
Military addresses are a separate format
Mail to service members uses APO, FPO or DPO in place of the city and AA, AE or AP in place of the state. There is no foreign country line, because the mail travels through the domestic postal network to a military post office.
SGT JOHN SMITH UNIT 2050 BOX 4190 APO AE 09204
The full rules, including customs forms and what cannot be shipped, are in our guide to APO and FPO shipping.
Return address placement
The return address goes in the top left corner of the same face as the delivery address, or in the return field of a printed shipping label. On an envelope it is small and top left. On a box it is either printed on the label or written above and left of the delivery block. Putting it on another side of the carton is a common error: if the delivery address fails, nothing routes the package home.
Address validation at checkout
For a brand, bad address data is one of the largest and quietest sources of failed deliveries, and it originates at checkout rather than in the warehouse. Customers type quickly on phones, autofill drops unit numbers, and a mistyped ZIP looks perfectly normal. What helps:
- Run address verification at checkout, not after the order is placed. Standardizing against the postal database catches ZIP and city mismatches before a label exists.
- Prompt for a unit number when the address resolves to a multi-unit building and none was entered.
- Label address line 2 clearly as apartment, suite or unit so shoppers stop putting the street there.
- Flag PO Boxes before the customer selects a carrier that cannot deliver to one.
- Hold suspicious orders for review instead of shipping them. A reship costs the product, the label and the support ticket, so a short pause is cheap.
- Keep billing and shipping separate. They are different fields for different purposes, as covered in billing address vs shipping address.
Where fulfillment fits
Once an order reaches a warehouse, address formatting stops being a writing question and becomes a data question. The order arrives from Shopify or another sales channel with address fields already populated, and the label is generated from those fields exactly as they were typed. At RitePrep, orders flow into our own Austin, Texas warehouse and are picked and packed at 99.9% accuracy for shipping nationwide. Getting the pick right does not help if the address is wrong, which is why address quality belongs at checkout rather than at the pack bench. If you are evaluating how orders move from cart to carrier, our pick and pack and shipping and logistics pages walk through the rest of the chain.