Etiquette
How to address an envelope to an unmarried couple
Give each partner their own line, in whichever order you know them best, or alphabetically by last name if you have no other basis to choose. Ms. Alice Chen on one line and Mr. Jordan Reyes on the next is standard for an unmarried couple, regardless of how long they have been together or whether they share a last name. The same two-line format applies to same-sex couples, and Mx. is available for a partner who does not use a gendered title.
Checked July 30, 2026/6 min read
Written by Claire PostReviewed against USPS Publication 28
What is on this page6 sections
An unmarried couple gets its own set of addressing rules mostly because the shortcut everyone reaches for, Mr. and Mrs., is specifically a marriage signal and does not apply. That leaves two names that need to be written correctly, in some order, with no automatic rule handed to you by a shared last name or a legal status.
The format itself is simple: two lines, one name each. What is less obvious, and what most etiquette guides skip past, is how to decide whose name goes first when nothing about the relationship tells you.
Step by step
Give each partner their own line
This is the core rule and it holds regardless of how long the couple has been together, whether they live together, or whether they share a last name.
MS ALICE CHENMR JORDAN REYES1420 N BROADWAY APT 4BDENVER CO 80202CorrectStandard two-line format for an unmarried couple. Order the names by whichever basis you actually have
List whoever you know better first, if that applies. If you know both equally well or neither, alphabetical order by last name is the simplest, most defensible default.
Use the same format for a same-sex unmarried couple
No different treatment. Two lines, each partner own name and title, ordered the same way as any other unmarried couple.
MR JORDAN REYESMR BEN CHEN1420 N BROADWAY APT 4BDENVER CO 80202CorrectA same-sex unmarried couple, same two-line format. Use Mx. for a partner who does not use a gendered title
Mx. functions the same way Mr. or Ms. does, just without specifying gender. It is a real, recognized title, not an improvisation.
MX JORDAN REYESMS ALICE CHEN1420 N BROADWAY APT 4BDENVER CO 80202CorrectOne partner using the gender-neutral title Mx. Join the names on one line only for a casual card
Alice Chen and Jordan Reyes, on a single line, works for an informal note. It is not the standard for anything more formal, such as a wedding invitation.
Quick reference
| Situation | Use |
|---|---|
| Standard unmarried couple | Two lines, one name each |
| You know one partner better | That partner listed first |
| You know both equally, or neither | Alphabetical order by last name |
| Same-sex unmarried couple | Same two-line format, no different treatment |
| A partner uses no gendered title | Mx. in place of Mr., Mrs., or Ms. |
| Casual note, not formal | Both names on one line, joined by and |
Special cases
The rule above covers most people. Here is what changes for the rest.
Is it wrong to combine an unmarried couple onto one line like Mr. and Mrs.?
It is not offensive, but it is inaccurate, since Mr. and Mrs. specifically signals marriage. For an unmarried couple, even one that has been together for decades, the two-line format with separate names is the more precise and more standard choice. Some couples genuinely prefer the combined casual style for informal mail, which is fine when you know that is their preference.
What if the couple lives at the same address but I only have one of their names on file?
Address it to the name you have, and consider adding "and guest" or the second partner first name if you know it, rather than guessing at a full name and title you are not sure of. Getting one name right is better than guessing both and getting one wrong.
Does the two-line rule change for a formal event like a wedding invitation?
No, if anything it matters more. A formal invitation to an unmarried couple still uses two lines, each partner full name and title, since formal correspondence is exactly where precision about marital status and individual identity matters most.
Key terms on this page
- Mx.
- A gender-neutral title, used the same way Mr., Mrs., or Ms. would be, for someone who does not identify with a gendered title.
- Precedence
- Which name is listed first when there is no automatic rule, such as marriage, to decide it. Alphabetical order by last name is the standard fallback.
- Social unit
- The etiquette-world term for a couple treated as a single addressing unit even though they are not married, still each getting their own line.