State Route 320 (SR 320) is a west-east state highway located entirely in Hamilton County in southeastern Tennessee.

it traverses mainly the eastern portions of the county, including Chattanooga’s eastern outskirts and the census designated place of East Brainerd.

SR 320 is known as East Brainerd Road its entire length, and begins at an intersection with Lee Highway (US 11/64/SR 2) near the Chattanooga Metropolitan Airport.

[3][4] TDOT has been working since 2015 to widen the route to four lanes to this point, and some of this project is already complete.

[5] Although the state route designation ends at this point, a county maintained road also labeled as East Brainerd Road continues east to SR 317 in Apison, and some maps show this portion as part of SR 320.