State Route 9E (SR 9E) was originally constructed early in 1941. In July 1981, as the extension of SR 400 had reached SR 60 in Dahlonega, this designation was removed.
The routing that was followed by SR 9E starts where Hopewell Road splits from the current SR 9 north of Coal Mountain in Forsyth County, and parallels SR 400 very closely. The road changes names to Lumpkin Campground Road as it crosses into Dawson County, passes by the North Georgia Premium Outlet Mall, then crosses SR 53 and SR 400 in rapid succession. Just before intersecting with SR 136 the road changes names again to Harmony Church Road, then is called Auraria Road as it becomes SR 136. The road crosses SR 400 once more to its west, parts ways with SR 136, then runs north through the community of Auraria into Lumpkin County to its northern terminus at SR 9/SR 52 west of Dahlonega.
State Route 131 (SR 131) was a state route located entirely in McIntosh County in the coastal part of the state. Established as a highway number in 1936, the first routing followed present-day State Route 99 east of U.S. Route 17 from Darien to the present-day terminus of State Route 57. It was moved to Harris Neck Road east of US 17 as a fully paved route in 1944 and extended along Jones Road in 1948 via a brief overlap with US 17. When the route was extended along Jones Road, it became a double spur with both sections extending off of US 17/State Route 25. This was the only such instance of a highway in Georgia where neither of the two endpoints terminated at a state highway. The western leg of SR 131 extended to the Jones Community along present-day Jones Road continuing as a county road beyond the western end. The eastern portion (Harris Neck Road) extended to Harris Neck National Wildlife Refuge. The western leg was the first to be decommissioned, turned to the county in 1977. The eastern leg lasted longer, most likely held back to obtain funding for a couple bridge replacement projects, until 1989.
The designation of State Route 143 (SR 143) was initially used for a 18.8 miles (30.3 km) stretch of what is today signed as SR 136 and SR 136 Connector, from an intersection with SR 2 east of LaFayette to Georgia. By 1941, an additional portion of SR 143 had been graded, running from SR 53 east of Fairmount to SR 5 in Tate; this roadway is called Henderson Mountain Road to its intersection with SR 108, and is designated as SR 108 to Tate at the present. By 1949, the part of today's SR 136 from the Alabama state line to Calhoun had all been re-designated as SR 143. It was 1979 when the portion of the route from the Alabama state line to Calhoun was re-designated as SR 136, and the portion from Fairmount to Tate as SR 379, which meant the disappearance of the designation of SR 143 in Georgia. The primary portion of SR 143, from the Alabama state line to Calhoun, measured 61.044 miles (98.241 km).
SR 160 was turned back to local maintenance in the mid-1990s, likely due to its proximity to State Route 331, which was separated from SR 160 by little more than a set of railroad tracks in Forest Park. The segment between SR 54 and US 23 still survives as State Route 54 Connector.
For a time, it was uncertain whether the designation route had in fact been removed in full due to an official Georgia Department of Transportation map of Clayton County dated 2005 continuing to label a portion of the route between SR 54 and the DeKalb County line as SR 160. However, that map was later updated and the label was changed to indicate the route as SR 54 Connector.
State Route 176 (SR 176) in Georgia was a route assigned to Cobb County. It ran for about fifteen miles (24 km) from C.H. James Parkway (U.S. Route 278) in Powder Springs to Cobb Parkway (U.S. Route 41) in Acworth. SR 176 was located entirely within Cobb County. The route was also known as Richard Sailors Parkway, New Macland Road, Lost Mountain Road, and Mars Hill Road. Famous landmarks along the former route include Lost Mountain Store, which is now a bank, and McEachern High School, which was once an A&M school. SR 176 was turned over to county maintenance in 2010.
State Route 205 (SR 205) was assigned to Bells Ferry Road in Cherokee County. This route was turned over to county maintenance in 1985. Though Bells Ferry Road does connect downtown Marietta with Canton, SR 205 began at its junction with State Route 92 in the Oak Grove district of southern Cherokee County. In the mid 1990s, Bells Ferry Road underwent an upgrade to a four-lane urban design roadway. This expansion of Bells Ferry Road, including part of the former SR 205, started at Interstate 575 and ended at South Fork Way, just north of Kellogg Creek Road (Old State Route 92).
Motorists use this road to access places such as the Little River Marina area of Lake Allatoona, Towne Lake Parkway, and the Bridge Mill development area south of Canton. The route originally formed a cutoff route between Acworth and Canton that was needed until the need was reduced by the completion of I-575. There are no plans to restore the state designation of 205.
State Route 287 (SR 287) was a south-north state route located in the west-central part of the state. The route ran from its southern terminus at the Macon-Taylor County line southeast of Reynolds north to State Route 96. This route is not a current state highway, it currently is known by the name Gen John B. Gordon Road.
State Route 290 (SR 290) was a south-north state route located in Quitman County in the southwestern part of the state. The route connected the town of Morris with U.S. Route 82/State Route 50. The route was turned back to local maintenance in 1981.
State Route 291 (SR 291) was a south-north state route located in Quitman County in the southwestern part of the state. The route connected the town of Hatcher with U.S. Route 82/State Route 50. The route was turned back to local authorities in 1981.
State Route 318 (SR 318) was originally constructed around 1960. Around 1986, this designation was removed.
The routing that was followed by SR 318 originally started about 1.5 miles (2.4 km) west of the current SR 9, about 1 mile (1.6 km) north of where SR 369 Conn meets SR 9 in Dawson County. For most of its existence, the state route portion started at the intersection with SR 9, however. The route crosses the former SR 9E, then US 19/SR 400 in rapid succession, and runs to its intersection with SR 53 just east of SR 400 and the North Georgia Premium Outlet Mall. The roadway is known as Dawson Forest Road today.
State Route 342 (SR 342) was originally constructed in 1963. In 1983, this designation was removed.
The routing that was followed by SR 342 starts where Keith Evans Road splits from the current SR 183, about 3 miles (4.8 km) north of SR 53 in Dawson County. The route crosses SR 136, changes names to Bailey Waters Road, and runs to its intersection with SR 52 east of Amicalola Falls State Park.
State Route 346 (SR 346) was a short west–east route located entirely in Jackson County in the northeastern part of the state. From its western terminus at U.S. Route 129/State Route 11 in Talmo, the route runs east through rural portions of Jackson County until it reaches its eastern terminus at State Route 82/ in Pendergrass. It was turned back to local maintenance in late 2003.
SR 351 saw its final days in 1982. However the route signage remained on I-75 until the early 1990s. This route lasted 20 years, originally commissioned in FY 1962-63. Although it no longer exists, many modern maps still show SR 351. It is now known as Jodeco Road in Henry County and Lake Jodeco Rd/Charles Q. Carter Hwy in Clayton County near Lake Spivey.
State Route 357 (SR 357) was a south-north state route located in Muscogee County in the western part of the state. From the route's southern terminus at Fort Benning (previously, the route's southern terminus had been at U.S. Route 27), the route ran north, then east, then north along several different roadways before reaching its northern terminus at U.S. Route 80/State Route 22 northeast of Columbus The route was turned back to local maintenance in 1982.
State Route 366 (SR 366) was a south-north state route located in Hart County in the northeastern part of the state. From the route's southern terminus at State Route 51 west of Hartwell, SR 366 ran north, concurrent with State Route 77. SR 77 departed to the west, and SR 366 continued north to its northern terminus at Interstate 85, northeast of Lavonia. The route was renumbered as SR 77 in 1990.
State Route 373 (SR 373) was a west–east state route located in Gordon County in the northwestern part of the state. From the route's western terminus at State Route 156 in Calhoun, SR 373 ran south along Barrett Street before traveling east on Dews Pond Road to the community of Cash, before turning south on Cash Road to its eastern terminus at State Route 53 in Sonoraville. The route only existed from 1972 to 1977.
State Route 379 (SR 379) was a west–east state route located in Pickens County in the northern part of the state. From the route's western terminus at State Route 53 east of Fairmount the route ran east-southeast along Henderson Mountain Road to its eastern terminus at State Route 108 west of Tate. The route was formed in 1977, after previously being numbered as State Route 143, and was turned back to local maintenance in 1981, having never been fully paved.
On April 4, 1977, Southern Airways Flight 242 attempted a landing on this stretch of highway near New Hope, Paulding County. The DC-9 crashed, killing the flight crew, 60 passengers, and 8 people on the ground. It also destroyed a gas station, grocery store, and other structures.
The highway designation was assigned in 1986 to replace SR 5 when it was removed from Canton Road, to allow the state to fund improvements to the road. As portions of the project were completed or cancelled, the SR 754 designation was gradually rescinded, finally being removed altogether in 2000.
Canton Road was designated as SR 754 when SR 5 was relocated to I-575 in 1986. This number was assigned to Old SR 5 to facilitate funding for the completion of a previously planned widening project along the two and three lane portions of route between the Canton Road Connector (SR 5 Spur) and Sixes Road in Holly Springs. No portion of the route was either signed nor maintained by the Georgia Department of Transportation.
The portion between SR 92 and Sixes Road was decommissioned in the early 1990s when the widening project was canceled, although improvements were constructed on that portion. The remainder was built from south to north and was decommissioned in phases as each portion was completed respectively in 1992, 1995, and 1998. The last portion was completed as an extension of the SR 92 widening project in the city of Woodstock in 2000 between the Woodstock city limits and just north of SR 92. When that last section was completed, SR 754 was decommissioned.
SR 754 is unique in the amount of confusion it caused. Maps continue to show the route 20 years after it first appeared, though it only existed on paper. Part of this is because it was a logical extension of SR 5 Spur, which ends where the Canton Road Connector to I-75 meets the former SR 5 mainline. Locals today continue to call this road "Highway 5" in addition to Canton Road.