Clarksville is a city in Red River County, Texas, in the United States. As of the 2000 census, the city population was 3,883. It is the county seat of Red River County. Clarksville is the birthplace of: John Edward Williams, author of the National Book Award fiction co-winner for 1973 Augustus and of the novel Stoner. Euell Gibbons, author of cookbooks and foraging guides, proponent of natural diets, and television personality popular in the 1960s and 1970s J. D. Tippit, a Dallas police officer who was shot and killed by Lee Harvey Oswald a few hours after Oswald assassinated President John F. Kennedy. Barney Cannon (1955–2009), a Country music deejay long associated with radio station KWKH in Shreveport, Louisiana, got his start in Clarksville in 1972, as a 17-year-old announcer. William Humphrey, author of National Book Award nominee "Home from the Hill", this book was also made into a movie directed by Vincent Minnelli shot on location in and around Clarsville in the late 1950s. Author of 5 other novels including "The Ordways" and "Hostage to Fortune", and the memoir "Farther off from Heaven".