Rex (formerly named Hollingsworth) is an unincorporated network in Clayton County, Georgia, with an elevation of 797 feet. Although Rex is unincorporated, it still has a post office and the ZIP code of 30273. Rex has a population of 11,412 according to the 2000 census.
A post office, known as “Rex” was established in 1882, leading to a town being formed in the area around it. Rex derived its name from the Latin word meaning “king”. Rex was integrated as a city in 1912 by the Georgia General Assembly and went on to have its municipal charter repealed in 1922. The Georgia Historic Trust identified the Historic Rex Village as a place in peril as of 2011.