[4] With a length of 12.8 km (8.0 mi), it extends from its junction with PR-159 and PR-5568 on the Cibuco–Padilla line in western Corozal,[5] passing through Cienegueta, Candelaria and Bajura barrios until its end at PR-676 in downtown Vega Alta.

[6] Puerto Rico Highway 647 is mostly a rural road with one lane per direction for its entire length.

In Corozal, it has a short length that extends from PR-159 and PR-5568 intersection to the Vega Alta municipal limit and is located entirely within Cibuco barrio.

[5] In Vega Alta, PR-647 has a long length, beginning from the Corozal municipal limit and ending at PR-676 in the city center.

[8] On 17 March 2022, this road was renamed as Carretera Palmira Cabrera de Ibarra the in honor of the politician from Vega Alta.