Rex is an unincorporated community in Clayton County, Georgia, about 20 miles southeast of downtown Atlanta. Also known historically as Hollingsworth, it has a post office with ZIP code 30273, and the surrounding ZIP Code Tabulation Area had a population of 16,580 at the 2020 census. The community's identity centers on Historic Rex Village, anchored by the red Rex Mill overlooking the creek that runs through the middle of town. Rex developed as a small crossroads settlement and later grew with the suburban expansion of Clayton County, so its landscape is now largely residential, with established single-family neighborhoods and townhome communities spread along State Route 42 and local roads such as Rex Road and Panola Road. Because Rex is unincorporated, county government provides its services, and its public schools belong to Clayton County Public Schools, with campuses such as Rex Mill Middle School serving local students. Nearby Morrow is home to Clayton State University, the only four-year public university in the county, adding an educational anchor a short drive away. Recreation is available through Clayton County parks, including Rex Park and the Carl Rhodenizer Recreation Center on Rex Road, with Panola Mountain State Park and the Arabia Mountain National Heritage Area within reach for hiking and outdoor activity. Commuters can reach downtown Atlanta in roughly 20 to 30 minutes, and Morrow, Ellenwood, and Stockbridge provide nearby shopping and services. The community's established neighborhoods, historic village core, and green space give it a quieter, more residential character than the dense parts of the metro while keeping jobs, the airport, and Atlanta's cultural amenities within a short drive. The result is a quiet, established Atlanta suburb with a distinct historic center and convenient access to the wider metro.