The post office closed in 1908. A proposed rail line linking Thornberry to Wichita Falls in Wichita County was never completed and the small town continued to suffer from its remote location. The population was reported as 20 until the 1960s.
The post office closure in 1908 led to Thornberry's isolation and hindered its growth. A proposed railway line connecting the town to Wichita Falls was never completed, further isolating it. The population remained small throughout history, with a reported count of 20 until the 1960s.