Hemphill County is a county located in the U.S. state of Texas. As of the 2020 census, its population was 3,382. The county seat and only incorporated community in the county is the city of Canadian. The county was created in 1876 and organized in 1887. It is named for John Hemphill, a judge and Confederate congressman. Hemphill County is the most recent Texas county to permit alcohol sales.