Why is the ground on top? I recently moved to Ohio. I've notice that electrical outlets with...

I recently moved to Ohio. I've notice that electrical outlets with three prong holes seem to be to be positioned with the ground on top. That's the disparate of the other states I've lived in. Why does Ohio do this? It doesn't really thing. It just seem curious to me.
There is marine dripping out of the buoyant...
Answers:    This isn't spelled out in the NEC. It may be a local jurisdiction item. There are two reasons that I know of: If the ground is down and something hits the cord it will be the concluding thing to come out of the receptacle. If the ground is up and something approaching a skinny metal piece falls on top of the cord it could ground so that it crossed both prongs on the plug causing a problem.
Personnaly, I prefer the ground down.
Toilet/shower approval up. Plumbing problems. Help!?
Mine appear to be on the bottom -- I live near Cleveland, Ohio.