Here in Maryland, the Department of Natural Resources only lists two venomous snakes: the copperhead and the timber rattlesnake.
However, we also have the northern water snake:
http://srelherp.uga.edu/snakes/nersip.htm
This snake is very often mistaken as a copperhead or water moccasin (cottonmouth). I had a run-in with one of these in a garden pond at the house were I used to live. They WILL make you think they are venomous! They don't hesitate to strike.
So, in my area, I admit I do have the luxury of essentially not having to worry about any venomous snakes in my yard or anywhere near where I normally go. The same goes for scorpions...none of that here.
Honestly, what concern me more are black widow and brown recluse spiders. We do have those, and I've actually had the heart-accelerating experience of working in the yard and discovering a black widow crawling on my ungloved hand! The brown recluse's venom is even more dangerous than the widow. Yes, any pests I find in the house I do kill, as with pests in the yard.
I actually get very few snakes in my yard where I live now. Usually, it will be a Dekay's snake. I really like seeing these, as their main diet is slugs, grubs, snails, beetles...that sort of thing. At my previous house, there was a greater variety...rat snakes, garter snakes, occasionally an eastern chain king snake.
I actually got a fair number of birds of prey, too. That was really cool. I'm glad I don't live there anymore, though. The wooded area next to my house that was the source of the critters has been shaved to the ground to make way for a self-storage facility. Today, the scenery from that house isn't a wooded area...it's a storage building and a parking lot.