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It crosses Hemphill County, Texas and enters Oklahoma in Roger Mills County. In Oklahoma it cuts through the Oklahoma Counties of: Roger Mills, Custer, Washita, Caddo, Grady, GarvinGarvin County is a county located in the U. State of Oklahoma. As of 2000, the population is 27,210. Its county seat is Pauls Valley 6. Geography According to the U. Census Bureau, the county has a total area of 2,107 km˛ (814 mi˛). 2,091 km˛ (807 mi˛) of, MurrayMurray County is a county located in the U. State of Oklahoma. As of 2000, the population is 12,623. Its county seat is Sulphur 6. Geography According to the U. Census Bureau, the county has a total area of 1,101 km˛ (425 mi˛). 1,083 km˛ (418 mi˛) of it i, CarterCarter County is a county located in the U. State of Oklahoma. As of 2000, the population is 45,621. Its county seat is Ardmore 6. Geography According to the U. Census Bureau, the county has a total area of 2,159 km˛ (834 mi˛). 2,134 km˛ (824 mi˛) of it i, and Johnston. Lake Texoma is the border between Bryan County and Marshall County.
Along its path the Washita River contains the Foss Reservoir. Small tributaries hold the waters of Fort Cobb Lake, Lake Chickasha, and Arbuckle Reservoir. The river passes through or near the Oklahoma towns of Cheyenne, Clinton, Anadarko, Chickasha, and Pauls Valley.
The river bisects the heart of the Anadarko Basin, according to the USGS the Anadarko Basin is the fifth largest natural gas formation area discovered in the United States.