Yes! I definitely have experienced feral cats in my area.
A few years ago, one morning I opened my front door to retrieve the mail from the mailbox only to be confronted by a very angry and openly hostile cat that I did not know. Never saw her before. But she apparently had made herself at home on or around my front porch. I tried shooing her away, but she hissed at me and arched her back like those cutouts of the witch's black cat you see on display during halloween. 
Well, since she obviously had full control of the situation, I quickly realized I needed some backup. So I called the local animal control folks who promptly sent out a very confident and capable young woman in a beige kahki outfit with a badge on her lapel which assured me I was being serviced by one of our town's finest civil servants. Anyway, I digress.
Once on the scene, the control person quickly established the perimenter. She asked me a few questions. (Just the facts maam. Just the facts.) Then she went back to her truck and got out a medium sized metal cage. She put the trap down near my front porch and behind some bushes. Inside the trap she put a small bit of food way in the back of the cage (enticement for my feral guest). She set the trap and gave me instructions to leave it alone, but keep an eye on it to see if anyone takes the bait. Then she left.
I would say, not even three hours passed before I heard, not the sound of the trap being sprung, but the sound of screams and the clawing of a very angry, mad trapped feral cat. Oh, she was NOT pleased! I don't even think she took the time to eat her din din...the bait. Chuckles. She hissed and spun in that cage like a whirling dervish. 
I got right on the phone to animal control as I wanted her gone as soon as possible. By now, it was kinda late in the day, but as if she was sitting at the desk just waiting for my call, the same animal control lady arrived and she scooped up that cat in cage, put her into her truck, and then she went back to the scene of the crime and found two or three small kittens living under my front porch right where this feral animal had established herself just days before. That was why she was so hostile...she was trying to protect her babies.
So anyway, all of them (momma and babies) were carted off to animal shelter heaven. Hopefully, they all found good homes as my B & B was now closed.
@terrylynnmarvin - Does Dana go out at all?
It's interesting getting a new post to this discussion, since I previously posted back in 2017! Since then, 2 of my 3 ferals live inside part-time, and 1 is inside full-time due to injuries. All 3 of them have full run of the house, and feel safe sleeping wherever they want. Only the indoor cat uses the litterbox consistently, one of the others might in an emergency, but the 3rd doesn't want to. That means that 2 of them go outside for the bathroom, and because they like being outside. They all spend nights inside. Compare with photos from 2017!
