Where I live they don't exist, except for a very rare Massasauga Rattlesnake, maybe 18" long. I don't think anyone has ever died from it's bite. In my 75 years I've only seen one (I think) as a kid, along a small river near home. I had a 22 auto and heard a sound at my feet, looked down to see this snake coiled and shaking it's tail, jumped about 3' straight up and emptied my 22 before I touched down, then ran like hell.
Then there was the time the Captain tried to get into my truck with a live Copperhead, that didn't happen either.
My youngest son and I went turkey hunting with Captain in some thick brush and open woods, really didn't think about snakes at the time but when we got back to the farm Doug asked about snakes and although we didn't see any, Captain said he smelled a couple. Later that night he and Doug drove the back roads looking for Copperheads or Rattlesnakes on the road, me, I stayed home.
All the times out west hunting with Troy, never saw or heard one,
Not a big fan of snakes, but can tolerate the small garden ones, try not to pass along my snake phobia to the grand kids and it seems to be working, they have no problem catching them.