Here is how to list all the names on a single outer envelope


Mr. and Mrs. John Doe
123 Fifth Avenue
Pittsburgh, Pennsylvania  15217
.
Doctors George and Anita Anderson
54 Maple Street
St. Louis, Missouri  33066
or
Doctor Anita Anderson and Mr. George Anderson
(Title comes first)
54 Maple Street
St. Louis, Missouri  33066
.
Mr. John Doe and Guest
Ms. Jane Doe and Guest
or
Ms. Jane Doe and Escort
.
Mr. and Mrs. John Doe and Family 
.
Mr. and Mrs. Patrick Evans
Susan and Andrew Evans (children)
34 Pitt Street
Pittsburgh, Pennsylvania  15216
.
Children 13 or older can be:
Emily Smith, Miss Emily Smith
Alex Smith, Mr. Alex Smith, Mister Alex Smith
Emily and Alex Smith
.............................................

If you must use both names for a married couple (I prefer Jane and John Smith):
Ms. Jane and Mr. John Smith

(Notice the wife is now Ms. and the man is listed 2nd so his first and last name stay together)

If married with 2 diffferent names:
Ms. Jane Doe and Mr. John Smith
.............................................

Mr. and Mrs. Alan Sachs
Misses Melissa and Rachel Sachs
504 Whipple Street
San Francisco, California  90202
.
Mrs. Murry Preston
Messrs. John and Andrew Preston
500 Country Club Road
New Kensington,Pennsylvania  15068
.
Mr. Alex Lane
Ms. Patricia Marx
Mr. Andrew Spencer
20 Falcon Ridge
Augusta, Georgia  30909
.
For more addressing ettiquette check out 
ADDRESSING INVITATIONS PROPERLY 
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You can also print out that page for your reference.