[2] With a length of 7.3 km (4.5 mi), it extends from its intersection with PR-568 near the Cuchillas boundary, passing through Negros barrio until its junction with PR-803 in Palos Blancos area.

[3] Puerto Rico Highway 805 is a rural road with a single lane per direction along its entire length.

In Negros, it extends from its junction with PR-568 near Cuchillas to its intersection with PR-807, passing though several neighborhoods and sectors with scenic views of the northern coast of Puerto Rico.

In Palos Blancos, PR-805 leaves PR-807 intersection until its end at PR-803 junction near the Monte Choca State Forest.

The current numerical designation corresponds to the 1953 Puerto Rico highway renumbering, a process implemented by the Puerto Rico Department of Transportation and Public Works (Spanish: Departamento de Transportación y Obras Públicas) that increased the insular highway network to connect existing routes with different locations around Puerto Rico.