Just over 2,000 feet (610 m) after Mims Road, it begins to travel along the Dooly–Houston county line.

[4] Just before intersecting the western terminus of County Line Road, it begins to curve to the southeast and enters Dooly County proper.

After traveling through Emerich and intersecting the eastern terminus of Leavens Road, it curves back to the east and meets its eastern terminus, an intersection with SR 230 west of Unadilla (and northeast of Snow Spring.

[5] SR 329 was built in the early 1960s on an alignment that was farther to the north than it travels today.

It began at SR 26 and traveled to the east to the intersection with County Line Road northwest of Emerich, where it does today.