Paper by Appointment is pleased to help
you solve the mystery of envelope addressing! In modern times,
there are many ways to address your envelopes appropriately based on
the marital status, family status or living arrangements of your
guests. Here are several examples:

Married couple (formal)
Outer: Mr. and Mrs. Paul Kennedy
Inner: Mr. and Mrs. Kennedy
Married couple (informal)
Outer: Mr. and Mrs. Paul Kennedy
OR
Tracy and Paul Kennedy
Inner: Tracy and Paul
Married couple with children under 18 living at home (formal)
Outer: Mr. and Mrs. Paul Ruiz
Inner: Mr. and Mrs. Ruiz
Miss Barbara Ruiz
Master Adam Ruiz
Married couple with children under 18 living at home (informal)
Outer: Mr. and Mrs. Paul Ruiz
Inner: Hazel and Paul
Barbara and Adam

Married couple, different last names (formal)
Outer: Mrs. Jill Livingston and Mr. Alexander Sanders
OR
Ms. Jill
Livingston and Mr. Alexander Sanders
Inner: Mrs. Livingston and Mr. Sanders OR
Ms. Livingston and Mr. Sanders
Married couple, different last names (informal)
Outer: Mrs. Jill Livingston and Mr.
Alexander Sanders
Inner: Jill and Alexander
Married couple, woman has hyphenated last name (formal)
Outer: Mrs. Jill Livingston-Sanders and Mr. Alexander Sanders
Inner: Mrs. Livingston-Sanders and Mr. Sanders
Married couple, woman has hyphenated last name (informal)
Outer: Mrs. Jill Livingston-Sanders and Mr.
Alexander Sanders
Inner: Jill and Alexander
Married couple, both are doctors, different last names
Outer: Dr. Jill Livingston and Dr. Alexander Sanders
Inner: Dr. Livingston and Dr. Sanders
Married couple, both are doctors, same last name
Outer: Dr. Jill Sanders and Dr. Alexander Sanders
Inner: The Doctors Sanders
Married couple, woman is doctor, (formal)
Outer: Dr. Marie Hunt and Mr. James Hunt
Inner: Dr. Hunt and Mr. Hunt
Married couple, woman is doctor, (informal)
Outer: Dr. Marie Hunt and Mr. James Hunt
Inner: Marie and James
Married couple, woman is doctor, different last names (formal)
Outer: Dr. Elaine Atkins and Mr. William Lipton
Inner: Dr. Atkins and Mr. Lipton
Married couple, woman is doctor, different last names (informal)
Outer: Dr. Elaine Atkins and Mr. William Lipton
Inner: Elaine and William
Married couple, man is a judge
Outer: The Honorable and Mrs. Troy Maxwell Clayton
Inner: Judge and Mrs. Clayton
Married couple, woman is a judge
Outer: The Honorable Christine Pritchett Clayton and Mr. Troy Maxwell
Inner: Judge Clayton and Mr. Clayton
Two sisters (formal)
Outer: Miss Isabelle Johnson
Miss Renee Johnson
Inner: The Misses Johnson
Two sisters (informal)
Outer: Miss Isabelle Johnson
Miss Renee Johnson
Inner: Isabelle and Renee
Two brothers (formal)
Outer: Mr. Isaac Johnson
Mr. Matthew Johnson
Inner: The Messrs. Johnson
Two brothers (informal)
Outer: Mr. Isaac Johnson
Mr. Matthew Johnson
Inner: Isaac and Matthew
Sister and brother (formal)
Outer: Miss Isabelle Johnson
Mr. Matthew Johnson
Inner: Miss Johnson
Mr. Johnson
Sister and brother (informal)
Outer: Miss Isabelle Johnson
Mr. Matthew Johnson
Inner: Isabelle and Matthew
Single woman, with or without guest (formal)
Outer: Miss/Ms. Jill Marie Livingston
Inner: Miss/Ms. Livingston
OR
Miss/Ms. Livingston and guest
OR
Miss/Ms. Jill Livingston
Mr. Charles Smith
Single woman, with or without guest (informal)
Outer: Miss/Ms. Jill Marie Livingston
Inner: Jill
OR
Jill and guest
OR
Jill and Charles
Single man (formal)
Outer: Mr. Alexander Sanders
Inner: Mr. Sanders
OR
Mr. Sanders and guest
OR
Mr. Alexander Sanders
Miss/Ms. Jill Livingston
Single man (informal)
Outer: Mr. Alexander Sanders
Inner: Alexander
OR
Alexander and guest
OR
Alexander and Jill
Divorced woman
Outer: Mrs./Ms. Jill Marie Sanders
Inner: Mrs./Ms. Sanders
Widow
Outer: Mrs. Alexander Sanders
Inner: Mrs. Sanders
Couple living together
Outer: Ms. Jill Livingston
Mr. Alexander Sanders
Inner: Ms. Livingston
Mr. Sanders
Two adult males living together
(alphabetically in this case, or by personal preference)
Outer: Mr. Alexander Sanders
Mr. Michael Trask
Inner: Mr. Sanders
Mr. Trask
Two adult females living together
(alphabetically, or by personal preference in this case)
Outer: Miss/Ms. Jill Livingston
Miss/Ms. Betsy Hamilton
Inner: Miss/Ms. Livingston
Miss/Ms. Hamilton

Married couple with children under 18 living at home
Mr. and Mrs. Richard Johnson
Isabelle and Matthew
Single person with unnamed guest
Ms. Susan Smith
and guest

The return address is printed on the
envelope flap and traditionally should be the address of those hosting
the event. If it is a wedding and the bride’s parents are
hosting then it should be the bride’s parents’ address
– names are not commonly used with a formal return address.
If the bride will be taking care of the responses it is okay to use her
address for the return address. Please note, guests who are
unable to attend or who wish to send their gift before or after your
wedding date will use this address to send packages.

Use
titles consistently. Courtesy titles may be abbreviated, such as
Mr., Mrs. and Dr. All guests should be titled or not.
Junior, Senior should be stated on outside envelope, not inner envelope.
Initials
should not be used for middle names. Leave them in or out.
However, if a guest never used his or her first given name, do not use
it in the address. An initial is acceptable here.
For
formal invitations, abbreviations should not be used for Street, Drive,
Avenue, Apartment, or for cities and states. Abbreviations can be
appropriate for informal invitations.
Street numbers under 20 should be written out.
Children and guest escorts should not be mentioned on outer envelopes, unless you are using single envelopes only.
If you know who your guest will be bringing, include their name in your address.
Children over the age of 18, still living at home, should each receive their own invitation.
Adults not romantically involved, living in the same household, should each receive their own invitation.

Consider sending an invitation to the
President of the United States or the Queen of England. They will
reply back to you with a lovely letter wishing you well on your
wedding. What a neat keepsake! Their respective addresses
are:
President and Mrs. George Walker Bush
The White
House
Greetings Office, Room 39
1600 Pennsylvania Avenue
Northwest
Washington, District of Columbia 20500
Her Majesty the Queen of England
Buckingham Palace
London, England