U.S. Highway 23 (US 23) in the U.S. state of Georgia is a north–south United States Numbered Highway that travels from the St. Marys River south-southeast of Folkston to the North Carolina state line, in the northern part of Dillard. At nearly 392 miles (631 km) in length, it is the longest U.S. Highway in Georgia.

State Route 4 (SR 4) is a state highway in the eastern part of the U.S. state of Georgia. Except for its northernmost portion, it is completely concurrent for its entire length with U.S. Route 1 (US 1). It traverses south-to-north through portions of Charlton, Ware, Bacon, Appling, Toombs, Emanuel, Jefferson, and Richmond counties in the southeastern and east-central parts of the state. The highway begins at the Florida state line, on US 1/US 23/US 301/SR 15 at the St. Marys River. It travels to its northern terminus at the South Carolina state line, on the Augusta–North Augusta, South Carolina city line, on US 25 Business at the Savannah River.