Question: The largest county in Oklahoma by area, gets its name from the broad rolling hills and rolling tallgrass prairie and Cross Timbers encompassing the county and surrounding areas, including portions of Mayes, Tulsa, Washington and Kay Counties, was created in what year?
Related documents: [0]  [DOC] The Osage Hills is a hilly area in Oklahoma, commonly known as "The Osage". The name refers to the broad rolling hills and rolling tallgrass prairie and Cross Timbers encompassing Osage County and surrounding areas, including portions of Mayes, Tulsa, Washington and Kay Counties. The Osage is the southern extension of the Flint Hills of Kansas. [END] 
[1]  [DOC] Osage County is the largest county by area in the state of Oklahoma in the United States. Created in 1907 when Oklahoma was admitted as a state, the county is named for and is home to the federally recognized Osage Nation. The county is coextensive with the Osage Nation Reservation, established by treaty in the 19th century when the Osage relocated there from Kansas. The county seat is in Pawhuska, Oklahoma, one of the first three towns established in the county. The total population of the county is 47,987. [END] 
Answer: 
1907
1907