Examples of Addressing a Letter | USPS Style Formats

If you’re staring at a blank envelope and thinking, “Where does each line go?”, you’re not alone. Mail moves fast through sorting gear and human hands. A tidy recipient block helps both.

This page gives ready-to-copy layouts for the most common situations: a friend’s house, an apartment, a P.O. Box, a business, campus mail, military mail, and international mail. Each sample uses fictional details, so you can swap in your own.

Common Letter Envelope Layouts At A Glance

Use Case	Recipient Block Lines	Sample (Fictional)
Home, single-family	Name → Street → City ST ZIP	Jordan Lee 742 Evergreen Rd Springfield IL 62704
Apartment	Name → Street + Unit → City ST ZIP	Taylor Brooks 1600 Lakeview Dr Apt 5B Madison WI 53703
Suite at a business	Name → Company → Street + Suite → City ST ZIP	Riya Patel North Shore Dental 88 Harbor St Ste 210 Boston MA 02110
P.O. Box	Name → PO Box → City ST ZIP	Sam Rivera PO Box 1138 Boise ID 83701
Campus mail	Name → Dorm/Dept → Street line (if used) → City ST ZIP	Amina Khan Maple Hall Room 214 100 College Ave Athens GA 30602
Military (APO/FPO/DPO)	Name + Unit → APO/FPO/DPO AA/AE/AP ZIP	Alex Morgan, Unit 2050 Box 4190 APO AE 09012
International (U.S. to abroad)	Name → Street line → Postal code + City → Region (if used) → COUNTRY	Marie Dubois 18 Rue des Lilas 75011 Paris FRANCE
“Care of” (c/o)	Name → c/o Host Name → Street → City ST ZIP	Chris Park c/o Dana Park 55 Pine St Portland OR 97205

Why Clean Formatting Helps Mail Arrive

Mail carriers and sorting machines look for patterns. They scan from the bottom line up, starting with the ZIP or postal code, then the city, then the street. If the last lines are messy, the piece may get slowed down for manual handling.

A clean block also helps when names are similar, streets repeat, or a building has many units. One missing unit number can send a letter on a detour inside the same building.

Examples of Addressing a Letter For Common Mail Types

Use these samples as a template. Keep the recipient block on the right half of the envelope, centered top to bottom. Leave space at the top right for postage.

U.S. home mail layout

Use two or three lines. Put the person’s name on line one. Put the street and any directional (N, S, E, W) on line two. Put the city, two-letter state code, and ZIP on line three.

If you want a reference for official formatting details, the USPS letter and postcard rules show standard mail-piece requirements and sizing.

Apartment, unit, and building notes

Keep the unit marker short: Apt, Unit, Ste, or #. Put it on the same street line when it fits. If the street line gets long, move the unit to its own line right under the street line.

Try to match what the resident uses on deliveries. If their lease papers say “Unit 12,” write “Unit 12,” not “Apt 12,” unless the building posts “Apt.” Consistency helps staff inside big buildings.

Business mail with attention lines

If you know the person, put their name first, then the company name. If you don’t know a person, lead with a role such as “Billing Dept” or “Human Resources.” You can add “Attn:” before that role when it helps routing inside the office.

Use the street line for the physical location and a separate line for a suite or floor. Keep commas out of the street line when you can; they add clutter and don’t help sorting.

P.O. Box mail

When a recipient uses a P.O. Box, put it on the street line spot. Do not add the street of the post office. The box number is the locator the postal clerk uses.

Write “PO Box” with a space, then the number. Keep the city, state, and ZIP on the next line.

“Care of” mail for someone staying with another person

Use “c/o” on the second line, followed by the host’s name. That tells the carrier which mailbox or desk should accept the letter even if the guest name is new to the location.

Keep the rest of the lines the same as home mail. If the building uses unit numbers, include them.

Campus and dorm mail

Colleges often route mail through a mailroom. Put the student name first, then the residence hall and room number, then any campus street line used by that school. Some schools skip the street line and rely on the hall name alone.

If the school publishes a campus mail format, follow it. One swapped digit in a room number can send the piece to the wrong mailbox inside the mailroom.

Military mail (APO, FPO, DPO)

Military mail uses a special city line: APO, FPO, or DPO, plus “AA,” “AE,” or “AP,” and a ZIP. Do not write a country name on the last line for these pieces, even when the unit is overseas.

Keep unit and box numbers on the line with the name when possible. If the unit line is long, break it into a second line, then keep the APO/FPO/DPO line last.

International mail basics

International formats vary, yet two rules stay steady: keep the destination country as the last line in all caps, and keep the postal code close to the city line. Many postal services prefer the code before the city.

For the United Kingdom, Royal Mail lists its preferred layout, including spacing for postcodes, on its international country guides pages.

Return Block Placement And Legibility Tips

Put your return block in the top left corner of the envelope. Use the same line order as the recipient block. Keep it smaller than the recipient block so the sorting scan still finds the destination first.

Write in dark ink. Skip pencil. If you print labels, use a clear font and keep the text flat, not curved. Smudges, fancy scripts, and cramped spacing are the usual troublemakers.

Packages And Large Mailers

Boxes and mailers follow the same line order, but placement matters more. Put the recipient block on the largest flat side, with the lines parallel to the long edge. Keep it away from seams, folds, and the opening flap so scanners see one flat label.

If you reuse a box, hide old labels and barcodes with tape or a new label. Two barcodes can send a parcel the wrong way. Add a return block on the same side, near the top left, and keep it smaller than the recipient block.

When you handwrite on kraft paper, use block letters and leave a blank strip along the bottom edge. That space is where sorting marks often land.

For international parcels, keep the country line in all caps, then place customs forms beside the label, not on top of it, so the street and postal code stay visible at all times.

Inside Letter Formats That Match The Envelope

Many letters include a recipient block inside the page too. The inside block can mirror the envelope layout. That way, the person reading the letter can check the mailing details without hunting for the envelope.

Personal letter inside block

Start with the date at the top. Leave a line, then write the recipient name and mailing lines. After that, add the greeting, then your message.

Business letter inside block

Use the recipient name, title, and company on separate lines if you have them. Keep the street line and city–state–ZIP lines the same as the envelope. If you add “Attn,” put it above the company name.

If you include a reference line like an invoice number, place it in the body, not in the mailing block. That keeps the mailing block clean for scanning and filing.

Common Mistakes And Fast Fixes

Missing unit or suite numbers

If the building has units, include the unit marker. If you don’t know it, ask the recipient before you mail. A correct street with no unit can stall delivery.

Wrong ZIP or postal code

Double-check the code. One digit off can route a piece to another town. If you’re not sure, look up the code with the recipient’s city and street, then copy it exactly.

Extra punctuation and stray words

Keep each line lean. Skip emojis, nicknames, and side notes like “near the park.” Put directions or notes inside the letter, not on the envelope.

Using a country line on APO/FPO/DPO mail

For military mail, do not add the overseas country name. The APO/FPO/DPO line and ZIP route the piece through the military postal system.

Quick Check Before You Seal The Envelope

Check	What To Look For	Fix
Name line	Full name or role matches the mailbox	Use the recipient’s preferred name or department
Street line	House number, street name, unit marker	Add Apt/Unit/Ste/# or move it to its own line
City line	City + state code + ZIP (U.S.)	Use a two-letter state code and the correct ZIP
International last line	Destination country in all caps	Place it alone on the final line
Military city line	APO/FPO/DPO + AA/AE/AP + ZIP	Remove any country line; keep the military line last
Return block	Your name and mailing lines at top left	Add it so the piece can come back if needed
Spacing	Clear gaps between lines, no crowding	Rewrite with wider line spacing or print a label

Mini Templates You Can Copy In Seconds

Below are copy-ready blocks you can paste into a label maker or print sheet. Swap in the real names and numbers, then keep the line breaks.

Standard U.S. home

Full Name
Street Number Street Name
City ST ZIP

Apartment

Full Name
Street Number Street Name Apt 3C
City ST ZIP

Business with person name

Full Name
Company Name
Street Number Street Name Ste 400
City ST ZIP

P.O. Box

Full Name
PO Box 123
City ST ZIP

APO/FPO/DPO

Full Name, Unit 1234 Box 5678
APO AE 09012

International

Full Name
Street Number Street Name
Postal Code City
COUNTRY

Final Notes For Neat, Low-Stress Mailing

Practice on scrap paper once, then copy your final lines onto the envelope. If you’re using labels, print one test label first so the text stays inside the safe area and doesn’t run into the stamp zone.

When you follow the patterns on this page, examples of addressing a letter become quick muscle memory. Keep this page handy, and your next envelope won’t slow you down.