Georgia State Route 166

Infobox road
state=GA
type=
route=166

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length_mi=
length_ref=Fact|date=April 2007
length_round=0
established=
direction_a=West
direction_b=East
starting_terminus=Alabama state line west of Carrollton
junction=
ending_terminus=Lakewood Avenue, southeast Atlanta
previous_route=165
next_route=167

State Route 166 starts at the Alabama line west of Carrollton in Carroll County. It goes around Carrollton on a by-pass route constructed in the mid-1900s. From there, S.R. 166 enters Douglas County where it remains mostly rural. After a short north-south concurrency with State Route 92, it enters Fulton County by crossing the Chattahoochee River. Once in Fulton County, S.R. 166 intersects Fulton Industrial Boulevard/Cascade-Palmetto Highway (State Route 70/State Route 154). S.R. 154 joins S.R. 166 at this intersection. Campbellton Road (S.R. 166/S.R. 154) crosses Camp Creek Parkway (State Route 6), entering the Sandtown community on its way to the Ben Hill community.

S.R. 166/S.R. 154 leaves the Ben Hill community as Arthur B. Langford Jr. Parkway. Langford Parkway, is a limited access freeway that was originally named the Lakewood Freeway and was planned as Interstate 420. It continues into East Point, passing the Fort McPherson Army base. S.R. 154 leaves Langford Parkway at Main Street (U.S. Route 29/State Route 14/State Route 139). After crossing the Downtown Connector, S.R. 166 dead ends into Lakewood Avenue in southeast Atlanta (Lakewood Heights).