I used to hear Cincinnat-uh a lot, but not lately. Even had a professor at OU that insisted on that pronunciation. Like nails on a chalkboard to me.
I am not an expert on all pocket dialects that exist in the region, but nobody here that I interact with pronounces it that way and my work puts me into contact with everything from inner city to country rural, both east and north of the city and into Kentucky and Indiana.
Usually when I hear Cincinnat-uh its followed by some old timer referring to a year like "it was 19 and a 52 when I......"
I did hear some stories about Chauncey (or Chance-ee?) while at OU that the pronunciation was altered during prohibition to help ID feds in the area looking to crack down on spirits made by moonlight. Anyone on here have the real story?
Ohio definitely has some interesting city/town/village names. I always enjoyed passing Coolville, Tunnel, Torch etc. when cruising Athens/Washington Counties in school.
We also have
Lima vs. Leema (as in Peru)
Galliapolis (I've heard that pronounced many ways)
It's always fun talking to a vendor from out of state trying to pronounce cities like Piqua.
I wonder how many states truly have a town for every letter of the alphabet? Not only do we have Xenia, but also Xavier University for a listing of Ohio attractions. Usually when I see one of my son's A-Z books for a place it's usually something lame like "X-Ray" or "X-tra fun"