This map was commissioned by the Cincinnati Chamber of Commerce sometime around 2013. It uses census data on inter-county residential mobility to estimate patterns of migration to and from the Cincinnati metro area.
And a couple closeups since I’m not uploading vector images here:
This was long enough ago now that my memory just cannot account for why I have two versions of this map, or even which one was actually the final draft.
I like the one above better, so I’m guessing that’s it.