State Route 305 (SR 305) is a north-south state highway, although it goes in a more northwest-southeast direction, in Meigs and McMinn counties of East Tennessee.

The highway then turns northwest to leave Athens and have an interchange with I-75 at exit 52.

It continues northwest through farmland and rural areas to cross into Meigs County.

It continues northwest through farmland before coming to an end at an intersection with SR 68.

The entire route of SR 305 is a two-lane highway.