I deliberately put this in the humor conference because in humor, fiction and non-fiction overlap frequently. I think I posted this experience before, but what the heck. I wrote a humorous essay for an inflight that published both fiction and non-fiction. To my mind it was definitely a non-fiction piece. It was accepted and published in their Annual Fiction Review.
Most times, it's a toss-up, and I believe many humor writers who write fiction stay away from pubs that print only non-fiction, and vice-versa. The Reader's Digest publishes non-fiction in most of its humor departments, but I don't believe most of the anecdotes are true.
Twice their researchers called me up--"fact checking" as they call it. On one particular piece for Campus Comedy I had to give a researcher my daughter's dorm phone number so she could verify that something actually occurred. It sort of occurred, but not exactly.
Erma Bombeck's kids said many times, "Mom must have had other kids we didn't know about."
I guess you can call some of it "creative non-fiction," but then, some writers may stay away from the fiction pubs because of it.