Where did Mrs. come from?

It’s the abbreviation for “mistress.”

That makes perfect sense. Good answer. Thanks.
(And I meant Missus, not the plural Misses)

I know this response is over a year late, but I am pretty certain that it is not the abbreviation for “mistress”. When a woman married a man (Mr.) she became his (Mr’s). However, with the rise of women in society, the apostrophe became very inappropriate so it was dropped-going from “Mr’s” to “Mrs”

My guess :
Mrs is used for married ladies and thus one the rr’s from the word married, are used to represent the married versus the MISS for the unmarried