For better or worse...I will be addressing my own invitations. I decided to take on the challenge because I want the handwritten look, but it's not in our budget to hire a professional calligrapher. I also thought it would be a fun project! While our invitations are being printed this week, I've been practicing my handwriting and trying to navigate the world of address wording etiquette. It's more complicated than I thought! And while our family and friends aren't sticklers for etiquette rules, it's one of those things - I like to know the rules before I decide which ones to break. :-)
Here are some of the most common rules. We are just having the single envelope (no inner one).
- Spell out Post Office Box, Street, Avenue, the word 'and,' etc. Spell out the state name, unless it won't fit on the same line as the city. Put the zip code on its own line. Use Mr. and Mrs. abbreviated, but spell out Doctor.
- Married couples: names go on the same line, unless there's a fit issue. The traditional way would be to say Mr. and Mrs. John Smith. Another option I like is from the first image, above. I don't see it in the rule books, but I like that it includes both the husband and wife's name - Mr. and Mrs. John and Jane Smith. If the woman has kept her maiden or professional name, her name goes first and the two names are on separate lines unless they fit easily on the same line.
- Unmarried couples: The names go on two separate lines, with the name of the person you know first. If you know both, the woman's name comes first or some places say to do alphabetical order when you know them both.
- Guests: try to find out the guest's name if you can. Many sources I'm reading say it's not good to put 'and guest,' but I think it makes sense in some cases.
- Kids: Write the parents according the 'married couples' guidelines and then put the kids first names below in order of oldest to youngest. If you only put the couple's names and not their children, it is assumed that it will be an adults-only affair.
Source: The Wedding Book by Mindy Weiss
If you're like me and you want a visual of the different variations there are some great resource and other options: here, here, and here.
Sources: 
In doing my research, I realized there are differing opinions about exactly how to address envelopes. I think the best thing to do is to pick your favorite style and then just be consistent.
Did you address your own envelopes? Do you have any tips for me?
Less than three months until the big day!!!