Bessie is a town in Washita County, Oklahoma, United States. The population was 181 at the 2010 census, a 4.7 percent decline from 190 in 2000. A post office called Bessie has been in operation since 1903. Some say Bessie was the name of the wife of a railroad official, while others believe the town derives its name from the Blackwell, Enid and South…Bessie is a town in Washita County, Oklahoma, United States. The population was 181 at the 2010 census, a 4.7 percent decline from 190 in 2000. A post office called Bessie has been in operation since 1903. Some say Bessie was the name of the wife of a railroad official, while others believe the town derives its name from the Blackwell, Enid and Southwestern Railway.