Forms of Address
Titles, suffixes, and modern forms of address
Mx (pronounced "mix") is a gender-neutral courtesy title, used in place of Mr., Mrs., Ms., or Miss for anyone who prefers not to specify gender in their title. Jr. and Sr. distinguish a son from a father sharing the same full name, while II, III, and IV are used more broadly, including for a grandson or nephew named after a relative, not only direct father-to-son lines.
Checked September 10, 2026/6 min read
Written by Claire PostReviewed against USPS Publication 28
What is on this page6 sections
Most of the titles on this site are tied to a specific job or office. This page covers the opposite: forms that apply regardless of profession, the gender-neutral Mx., the generational suffixes that distinguish family members sharing a name, and the long-standing Miss/Mrs./Ms. distinction that still trips people up.
None of these are complicated in isolation, but they intersect with almost every other page on this site, since a suffix or gender-neutral title can apply to a president, a judge, or an ordinary recipient of a birthday card exactly the same way.
Step by step
Use Mx for a gender-neutral courtesy title
"Mx. [Full Name]" works exactly like Mr. or Ms. in a formal address, for anyone who has indicated Mx as their preferred title, or when a gender-neutral option is specifically appropriate and the person own preference is not known.
MX JORDAN T PARKER220 ELM STREETAUSTIN TX 78701CorrectA gender-neutral courtesy title on an envelope. Use Jr. and Sr. specifically for a father-and-son pair sharing a full name
Jr. applies to a son who shares his father exact full name while the father is still living; Sr. is then sometimes added to the father name to distinguish him, though it is optional and less commonly used than Jr. for the son.
Use II, III, IV more broadly than Jr./Sr.
Unlike Jr., which is specifically father-to-son, the numeric suffixes II, III, and IV can apply to a grandson, nephew, or other relative named after an ancestor, not only in a direct unbroken father-son chain.
Choose between Miss, Mrs., and Ms. based on what is actually known
"Miss" traditionally indicates an unmarried woman; "Mrs." indicates a married woman, generally paired with her husband name in the most traditional form; "Ms." makes no marital status claim at all and is the safer default when marital status is not known or not relevant.
Quick reference
| Title/Suffix | Meaning | When to use |
|---|---|---|
| Mx. | Gender-neutral courtesy title | Preferred title, or when gender is unknown/not specified |
| Jr. | Son sharing father exact full name | While the father (Sr.) is still living, traditionally |
| II, III, IV | Named after an ancestor, any relation | Broader than Jr.; not limited to direct father-son |
| Miss | Unmarried woman (traditional) | When marital status is known and this form is preferred |
| Mrs. | Married woman (traditional) | When marital status is known and this form is preferred |
| Ms. | No marital status specified | Safe default when status is unknown or irrelevant |
Special cases
The rule above covers most people. Here is what changes for the rest.
Does Jr. ever get dropped after the father passes away?
Convention varies by family and individual preference; some drop Jr. after the father death, others retain it for consistency with lifelong legal and professional records. There is no single universal rule, so deferring to the individual own current usage is the safest approach.
Is it ever appropriate to guess Miss versus Mrs. based on age?
No, marital status cannot be reliably inferred from age or appearance. When it is not known and the context calls for a title, Ms. avoids the guess entirely.
Where does this apply to an actual envelope, like a married couple?
The suffix and title choices here feed directly into scenarios like <a href="/how-to-address-envelope-married-couple/">addressing a married couple</a> or <a href="/how-to-address-envelope-to-widow/">addressing a widow</a>, which cover the full envelope-line format for those specific situations.
Key terms on this page
- Mx.
- A gender-neutral courtesy title, pronounced "mix," used in place of Mr., Mrs., Ms., or Miss.
- Suffix
- A name element following the surname, such as Jr., Sr., or a numeral, indicating a relationship to another family member sharing the same name.