Dickinson is a city in Galveston County, Texas, United States, within Houston–The Woodlands–Sugar Land metropolitan area. The population was 20,847 at the 2020 census. Dickinson is located on a tract of land granted to John Dickinson in 1824, and named after him. A settlement had been established in this area on Dickinson Bayou before 1850. The Galveston, Houston, and Henderson Railroad was built directly through Dickinson. This line was used in the American Civil War to successfully retake Galveston.