State Route 40 | ||||
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 SR 40; mainline in red, spur routes in blue | ||||
| Route information | ||||
| Maintained by GDOT | ||||
| Length | 30.46 mi[1] (49.02 km) | |||
| Existed | 1919[2]–present | |||
| Major junctions | ||||
| West end |      US 1 / US 23 / US 301 / SR 4 / SR 15 in Folkston | |||
| East end | Church Street in St. Marys | |||
| Location | ||||
| Country | United States | |||
| State | Georgia | |||
| Counties | Charlton, Camden | |||
| Highway system | ||||
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State Route 40 (SR 40) is a 30.46-mile-long (49.02 km) state highway in the southeast part of the U.S. state of Georgia. The highway travels from Third Street in Folkston east to Church Street in St. Marys. SR 40 is the primary east–west highway of eastern Charlton County and southern Camden County. The highway connects Folkston and St. Marys with Kingsland, where the highway meets Interstate 95 (I-95) and US 17/SR 25. SR 40 also serves as the majority of the route from I-95 to Naval Submarine Base Kings Bay and Cumberland Island National Seashore. SR 40 has a pair of auxiliary routes: a connector route in Folkston and a spur route in St. Marys that provides access to the submarine base and Crooked River State Park.
SR 40 was assigned to the Folkston–St. Marys highway in the early 1920s. The highway was first improved in the mid-1920s and paved in the mid-1930s from Kingsland to St. Marys. SR 40 was paved from Folkston east to the Charlton–Camden county line in the late 1930s and from the county line to Kingsland in the early 1940s. The highway was extensively relocated between Folkston and Kingsland in the mid-1960s. SR 40 was expanded to four lanes, much of it divided highway, east of Kingsland in the 1980s. The Georgia Department of Transportation (GDOT) has long-term plans to expand the state highway to a four-lane divided highway from Folkston to Kingsland. The first portion of this project was completed east of Folkston in the mid-2000s.