Tenkiller is an unincorporated community and census-designated place in Cherokee County, Oklahoma, United States. The population was 390 as of the 2020 Census. Tenkiller is located in southeastern Cherokee County. It is bordered to the north by Welling, to the west across the Illinois River by Park Hill and Keys, and to the east by Rocky Mountain in Adair Coun…Tenkiller is an unincorporated community and census-designated place in Cherokee County, Oklahoma, United States. The population was 390 as of the 2020 Census. Tenkiller is located in southeastern Cherokee County. It is bordered to the north by Welling, to the west across the Illinois River by Park Hill and Keys, and to the east by Rocky Mountain in Adair County. The community of Dry Creek is a short distance to the south. Tahlequah, the county seat, is 13 miles to the northwest via Welling Road.