William "Bill" and Mary moved to the Tishomingo area in Indian Territory before Oklahoma statehood. "Bill" served as a DeputyTerritorial Sheriff in the Tishomingo Territory.
They are listed on the 1900 Indian Territory Census living in the Chickasaw Nation. Both William and Mary are listed as 37 years old, have been married 18 years, and are the parents of 8 children, 5 of whom are living. They are listed as John 17, Abraham 15, Samuel L. 10, Lydia E. 3, and Carrie 2/12.
They are listed on the 1910 Atoka County OK Census, living at Caney in household #180 with their children John, Liddie, and Carrie. On the census record his name is listed as "Bill". Living next to them in household #181 is their son Sam and his wife,Tennie, with their children Pearl and Burlie.
1920 McCurtain Co. OK Census: William M. Clement 58, Mary T. Clement 58, Liddie Ellen 22, Ollie Clement 8 months old. Liddie is listed as a daughter and Ollie is listed as a granddaughter.