Neither. Do you have water close by? That's looks like a common water snake. It has too thick of a body to be a corn or black snake.
David, keep it as they are very beneficial.
After saying that though, I have had to re-home two black snakes out of my barn, caught them in my baby chickens' pen trying to eat my baby chicks.
My son picked up this little beauty yesterday
hog island 1.jpg
Ummm that looks a lot like a copperhead to me--triangular shaped head and all.....