Federal courts have exclusive jurisdiction over bankruptcy cases. This means that a bankruptcy case cannot be filed in a state court. There are three federal bankruptcy courts in the State of Oklahoma: the Northern District located in Tulsa, the Eastern District located in Muskogee, and the Western District located in Oklahoma City. The link below lists the counties served by the Northern District located in Tulsa.
http://www.oknb.uscourts.gov/oklahoma-counties-district-where-do-i-file
http://www.oknb.uscourts.gov/oklahoma-northern-district-county-map