Part of that is due to historical factors such as the fact Ohio was one of the states with the most registered KKK members during the height of the second Klan’s popularity nationwide from ~1915 until the mid-20’s when the case of Madge Oberholtzer being kidnapped, raped, and viciously mutilated by a senior KKK leader in Indiana scandalized the racist organization and caused its membership to rapidly plummet in a matter of months.
Wouldn’t surprise me if similar displays of Confederate flags in say parts of rural central Pennsylvania or upstate NY originated in part from influences from that era and attitudes from some die-hards who not only refused to drop their allegiances, but also passed them down the generations. .