Columbus usually has a few...check out the Seeking Cosplayers section of the forums here and look for the Ohio thread..sometimes there are gathering posts there.
I'm actually originally from Chillicothe and I can honestly say there isn't much of a cosplay community there. I'd occasionally see a few teenagers out and about wearing anime shirts/pins/bags but I've never run into cosplayers. I know Ohio University at one time had an anime club and they had a couple of cosplayers but I'm not sure if it's still active or not.
I'm only a male lust object on the weekends." -Meng Xiaojie-
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