Osage is considered one, the only tribe in the state to retain a federally recognized reservation.
I'm gobsmacked. I'm a native Sooner...and I get corrected by a Volunteer.
But the Osage Reservation (Osage County) has to be the oddest Indian reservation in the country. Of the 47-some thousand folks living in the county, 66% are white, 11% are black...and only 14% are Native American.
I've been to Osage County numerous times and was never aware that it was still a reservation. Nor did any of the folks from Osage County that I knew ever mention it.
I'm pretty sure the county government is separate and independent from the tribe, though.