Maiden name
Ms. Jones
Miss Mary Jones [for girls under 18]

Married, keeping maiden name
Ms. Mary Jones

Married, uses husband’s name socially
Mrs. Mark Carter
Mrs. Mary Carter
Ms. Mary Carter

Separated, not divorced
Mrs. Mark Carter
Mrs. Mary Carter
Ms. Mary Carter

Divorced
Mrs. Mary Carter
Ms. Mary Carter
Ms. Mary Jones [maiden name]

Widowed
Mrs. Mark Carter [most traditional]
Mrs. Mary Carter
Ms. Mary Carter

Mark as helpful. 4

Posted in: Etiquette, Envelope addressing etiquette