State Route 20
Georgia State Route 20 follows a circuitous course 166.31 miles east from the Alabama state line, west of Rome, around Atlanta to U.S. 19/41 and Lower Woolsey Road at Hampton. SR 20 accompanies U.S. 411 between Rome and Cartersville. East from I-75, SR 20 travels to I-575 at Canton and Cumming.
Heading southeast from the freeway along SR 400, SR 20 leads to Sugar Hill, Buford and the Gwinnett County suburbs. Turning south from I-985/U.S. 23, the state route continues to Lawrenceville, before shifting southeast again to U.S. 78 at Loganville.
The remainder of SR 20 from Loganville to Hampton travels south or southwest. The route continues to Conyers, where it overlaps with SR 138 and meets Interstate 20. SR 20 drops south from there to SR 212, then southwest to an overlap with SR 81 in McDonough.
Beyond Interstate 75, SR 20 parts ways with SR 81 and extends west to a grade separation with U.S. 19/41 in the city of Hampton. The route ends at Lower Woolsey Road, west of U.S. 19/41 and south of EchoPark Speedway (formerly Atlanta Motor Speedway).
East
SR 20 (Knox Bridge Highway) east at the signalize entrance to the ACTIVE Academies school on the suburban west side of Canton.
03/15/22
SR 20 (Knox Bridge Highway) either straddles the Canton municipal limits or passes through sections of it east before wholly entering the city at the intersection with Marietta Highway (Old SR 5).
03/15/22
SR 20 overtakes Marietta Highway east from Knox Bridge Highway and Herndon Lane. Marietta Highway is Old SR 5 south to Holly Springs.
03/15/22
SR 5BU/140 follow Marietta Highway south to the expressway taking SR 20 east to Interstate 575.
03/15/22
East 
South
SR 5BU south and SR 20/140 east lead away from Marietta Highway with two lanes to the grade separation with Marietta Road.
03/15/22
SR 5BU south ends at the directional T interchange taking SR 20/140 east onto Interstate 575 north as part of a bypass around Canton.
03/15/22
West
SR 20/81 overlap 3.5 miles west from SR 155, east of Downtown McDonough, to Avalon Parkway just beyond the exchange with Interstate 75.
03/15/26
East
SR 20 intersects E Main Street (Old U.S. 19/41) in the city of Hampton beyond the entrance ramp from U.S. 19/41 north.
06/24/10
Prior to the construction of Bruton Smith Parkway, SR 20 followed Rosenwald Drive and McDonough Street across Hampton to the north.
06/24/10
SR 20 continues ten miles northeast to the Henry County seat of McDonough. The Rockdale County seat of Conyers is 14 miles further north along the state route.
06/24/10
SR 20 meets Interstate 75, 7.3 miles northeast of E Main Street in Hampton.
06/24/10
Hampton Locust Grove Road runs east from SR 20 in Hampton to SR 155 at Bill Gardiner Parkway. Bill Gardiner Parkway meets Interstate 75 at Exit 212 in the city of Locust Grove.
06/24/10
Hampton Locust Grove Road west leads to McDonough Street (Old SR 20) in Hampton.
06/24/10
McDonough Street (Old SR 20) east ties into SR 20 at the next intersection north of Hampton Locust Grove Road.
06/24/10
SR 20 reassurance marker posted east of McDonough Street.
06/24/10
The diverging diamond interchange joining SR 20/81 with Interstate 75 is 5.5 miles northeast of McDonough Street.
06/24/10
SR 20 reassurance marker posted along McDonough Hampton Road east of Mosby Creek Drive.
06/24/10
Westridge Parkway intersects SR 20 west of an array of distribution centers and east of the Westridge development.
06/24/10
SR 20 continues northeast from Westridge Parkway toward the city of McDonough.
06/24/10
SR 81 travels 8.45 miles east from U.S. 19/41 near Lovejoy to SR 20 at Avalon Parkway in McDonough.
06/24/10
SR 20/81 overlap 3.3 miles northeast to SR 155 in McDonough.
06/24/10
SR 20/81 meet Interstate 75 just beyond the old alignment of SR 81.
06/24/10
Interstate 75 runs across the west side of McDonough northwest to Atlanta and southeast to Forsyth and Macon.
06/24/10
Construction in 2022 converted the diamond interchange (Exit 218) joining SR 20/81 with I-75 into a DDI.
06/24/10
West
Distance sign referencing Sugar Hill at one mile, Cumming at 11 miles and Buford Dam at seven miles, posted west of SR 13 on SR 20 (Buford Highway).
10/26/15
Commerce Drive arcs 0.62 miles west from SR 13 (Buford Highway) to SR 20 (Buford Drive) at the succeeding traffic light beyond the separation with U.S. 23 south.
10/26/15
Peachtree Industrial Boulevard is a major arterial running southwest from SR 20 at Sugar Hill to Suwanee and Norcross. The arterial also extends northeast to Buford.
10/26/15
SR 20 continues west through the city of Sugar Hill to Suwanee Dam Road.
10/26/15
Advancing northwest across the Chattahoochee River, SR 20 (Buford Highway) enters Forsyth County. The suburban arterial meets Trammel Road south and Samples Road north at a commercialized intersection.
10/26/15
SR 20 (Buford Highway) west next intersect Hawcreek Circle E west and Habersham Gate Drive east to The Gates subdivision.
10/26/15
Sanders Road stems 1.60 miles north from SR 20 (Buford Highway) to Mary Alice Park Road.
10/26/15
Paralleling the freeway along U.S. 19/SR 400, Market Place Boulevard heads north along an array of big box retail and other businesses 2.55 miles to Bald Ridge Marina Road. Ronald Reagan Boulevard extends the arterial southwest.
10/26/15
SR 20 (Buford Highway) proceeds northwest from Market Place Boulevard into a parclo interchange (Exit 14) with U.S. 19/SR 400.
10/26/15
SR 400 constitutes a freeway north to SR 369 near Coal Mountain and south to Interstate 85 at Buckhead in Atlanta.
10/26/15
U.S. 19 overlaps with SR 400 south to Interstate 285 at Sandy Springs.
10/26/15
West North
SR 20/140 separate from I-575 south along an expressway spur with SR 5 Business linking to Marietta Highway in the city of Canton.
03/15/22
SR 20 and SR 5BU/140 part ways west beyond the Marietta Road overpass.
03/15/22
SR 140 and SR 5BU continue north along Marietta Highway to the commercialized intersection of Waleska Street and Riverstone Parkway in Canton.
03/15/22
SR 20 initially follows Marietta Highway west from SR 5BU/140 before shifting onto Knox Bridge Highway en route to Cartersville.
03/15/22
West
Leading away from SR 5BU/140, SR 20 passes Canton Corners shopping center in Canton.
03/15/22
SR 20 west shifts onto Knox Bridge Highway as Marietta Highway (Old SR 5) turns south to Holly Springs.
03/15/22
Herndon Lane ties into Marietta Highway where SR 20 eastbound leaves Knox Bridge Highway.
03/15/22
Knox Bridge Highway comprises a three lane boulevard through suburban areas of southwest Canton.
03/15/22
The signalized entrance to the ACTIVE Academies Campus was expanded when a self storage facility was built along the south side of SR 20 in 2023.
03/15/22
SR 20 west at Butterworth Road east and River Green Avenue north into the River Green development.
03/15/22
Photo Credits:
- Brent Ivy: 03/15/22, 03/15/26
- ABRoads: 06/24/10
- Alex Nitzman: 10/26/15
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Page Updated Tuesday March 24, 2026.