Gillespie County is located on the Edwards Plateau in the heart of the Texas Hill Country. Gillespie is named for Robert Addison Gillespie, who came to Texas in 1837. He was a Texas Ranger, an Indian fighter, a merchant and a soldier in the Mexican-American War. It became a County in 1848 when the area separated from Bexar and Travis Counties.
As of the 2014 Census, Gillespie County had a population of 25,520. Fredricksburg, the County's largest city and County seat, had a population of 10,886. President Lyndon B. Johnson was born in Stonewall, on the eastern part of the County.
Gillespie County comprises the Fredricksburg, TX Micropolitan Statistical Area.