How to address a woman?

Miss is the form always used for girls.  

Mrs. is used for a married woman. 

Ms. is only used for adult women (18 or older). 

Ms. is generally used for unmarried women. It’s also a safe option for women of any age whom you are unsure how to address. 

Ms. can also be used (instead of Mrs.) for a married woman. Miss cannot be used in this way. 

Ms. is neutral in terms of marital status: it doesn’t specify whether the woman is married or not. 

Mx. is a gender-neutral title invented recently as a way of referring to someone without specifying their gender. 

Mx. is primarily used in writing;