Boston is a city in Thomas County, Georgia, United States. As of the 2020 census, the city had a population of 1,207. Boston was incorporated …Boston is a city in Thomas County, Georgia, United States. As of the 2020 census, the city had a population of 1,207. Boston was incorporated by the Georgia General Assembly in 1870. An early variant name was "Blue Springs"; the present name is after Thomas M. Boston, who found a medicinal spring near the town site. Boston, Georgia is home to one of the original Carnegie Libraries, and one of a handful in Georgia that is still being used as a library.