On the outer envelope it should read:
PERSONAL
Mr. & Mrs. John Doe
c/o Zero Acme Co.,
0000 Hawthorne St.
San Francisco, CA
ZIP CODE #
Married or not , this person may be rightly addressed as Dr.
Address it as 'Pastor---(the name of the pastor).
Same as to anybody else. Put the name and address of the person clearly in the center of the envelope.
I was always told that you never seperate a man's name. So, if you are addressing a card or envelope informally, and the couple is married, it should be addressed: Jane and John Doe
You can address it to only one, or address it to both using both names. Either way is acceptable.
The correct way to address an envelope to a married couple that have different last names is to use both of their names. For example, you could write Mr. Johnson and Miss or Ms. Dwyer.
In most cases, if you know that a woman is married you would call her Mrs., and if you do not know whether she is married, or if you know that she is not married, you would call her Ms. Also, it is polite to address people as they wish to be addressed, so even a married woman could be addressed as Ms. if that is how she wishes to be known.
* Senor & Senora ____________________. Senorita is single, Senora is married.
In this wonderful modern age you can simply write her name on the envelope. It doesn't need to label her as married, unmarried, engaged, solo, etc. For example: If the person's name is Giselle Renoir and you want to invite her to a party then simply address the envelope to Giselle Renoir at her address. If you want to invite her husband too then simply address it to Giselle and Pierre Renoir.
American people use the title Ms. to address women, over 18 that are either married or unmarried. Women who are under 18 are addressed as Miss.
Dear Mr. (name) and Mrs (name)
Dr. John Smith Dr. Mary Brown if they are at the same address, of different genders and not married. Dr. John Smith & Dr. Mary Brown if they are at the same address and married but not using the same last name. Drs. John & Mary Smith if they are married and using the same last name Dr. John Smith Dr, Fred Brown if they are at the same address of the same gender and not married. The progression is the same as above if they are married.