I've always liked snakes, but here I can honestly say I've never come across a poisonous one. (Another reason to live in PA!) I've grown up in Beaver Co., our camp, about 1/3 of my growing up was in Crawford Co., and now I live in Pittsburgh County. I have never, ever come across a poisonous snake...but they are here. I've just been lucky. Once every couple years a farmer or landscaper gets hit. I'll stay up here & let you warm people fight with every deadly poisonous creature in North America!
One time, Daisy, the Weim, came face to face with a garter snake. They get aggressive when cornered or pikked off. It was only about a two-footer. It lunged and she was like a cat and jumped out of its way! Didn't think she could do it, but young dogs are quicker than you think when they have a split second to see their attacker.
Those Coral snakes. Isn't there another snake with the same coloring only in different order of color? I want to say King, but that doesn't sound right.