State Route 339 (SR 339) is a 23.1 miles (37.2 km) long east-west state highway in the mountains of East Tennessee, connecting Cherokee Hills with Cosby.

For the majority of its length, SR 339 is known as Jones Cove Road, but other short sections are known as Long Springs Road and Old Newport Highway.

It goes southeast through farmland to an intersection with Old Newport Highway, which it follows for approximately 1.3 miles.

It then turns right onto Jones Cove Road and winds its way east through farmland and rural areas, paralleling the East Prong of the Little Pigeon River for most of the river's remaining length.

[2][3][4] On some maps, and Google Earth, show SR 339 continuing east past US 321/SR 32 to I-40 near Hartford.