Place card etiquette - mr & mrs for married couples only?

We did individual ones per person.

If you're going to use Mr. and Mrs. for married couples, I think unmarried couples deserve the same formality.

You should have the same formality. Also, just as a side note: place cards have just 1 name, as they are at the exact seat the individual is assigned to, if you are assigning seats. Escort cards are the cards that just assign the table.

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Exactly this.

We are doing individual cards for each person as well.

For the married couples I did one placard. For singles they got their own and for those that brought guest, I did so and so and their guest. No one made any comments about it either, I think that people are just happy to have a seat. Dont stress over this

If people are getting upset over the way their name is written on a seating card, they have issues. Lol I agree they should all be cohesive but it's not the end of the world and not worth stressing over. If you know that you specifically have a Dr attending and know they would prefer to have their card state this, then go ahead but you could always just write John and Joan Smith as well as John Smith and Joan Wood for the other cards.