I’m always interested to see these states that have so many counties. OK is 65.5K square miles and 77 counties. By contrast CA is two and a half times bigger At 156K square miles, but only has 58 counties
I don’t know about other states, but when Oklahoma was divided into counties, the county seat was to be within one day’s buggy ride from anywhere in the county. There are some counties where this doesn’t seem possible but that was the idea.