| State: | PR |
| Type: | PR |
| Route: | 164 |
| Length Km: | 16.4 |
| Established: | 1953 |
| Direction A: | West |
| Terminus A: | in Pueblo–Palmarejo |
| Junction: |
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| Direction B: | East |
| Terminus B: | in Nuevo |
| Municipalities: | Corozal, Naranjito |
| Previous Type: | Urban |
| Previous Route: | 163 |
| Next Type: | Urban |
| Next Route: | 165 |
Puerto Rico Highway 164 (PR-164) is the main road from Naranjito to Corozal in Puerto Rico. It begins at the intersection of PR-167 and PR-148 in eastern Naranjito, passing through downtown. Then it goes to Corozal from its junction with PR-5 and PR-152 until reaching PR-159 near downtown Corozal. This road is 16.4km (10.2miles) in length.
This highway consists of one lane in each direction for most of its length between Naranjito and Corozal. In Naranjito, PR-164 travels from its intersection with PR-148 and PR-167 in Barrio Nuevo to the Corozal municipal limit, crossing through downtown Naranjito, Achiote and Lomas barrios on its way across this municipality. In Corozal, PR-164 travels from the Naranjito municipal limit to its western terminus at PR-159 junction, passing through Palmarejo and Barrio Pueblo. Among the most important intersections are PR-5, that goes to Bayamón; PR-152, that heads to Barranquitas; PR-159, the main highway between Morovis and Toa Alta; PR-165, which leads to Toa Alta, and PR-167, the main road between Comerío and Bayamón.
Puerto Rico Highway 164 crosses the following rivers:
The entire length of PR-164 is part of the eastern section of the old Road 20, a highway that led from Naranjito to Ciales through Corozal and Morovis until the 1953 Puerto Rico highway renumbering, a process implemented by the Puerto Rico Department of Transportation and Public Works (Spanish; Castilian: Departamento de Transportación y Obras Públicas) that increased the insular highway network to connect existing routes with different locations around Puerto Rico. Route 20 was divided into two segments: the first one, from Naranjito to Corozal, and the second one, from Corozal to Ciales. The first section corresponds to the current PR-164 from PR-167 (old Road No. 9) to PR-159 (former Road No. 10), while the second one went to Morovis through PR-159, beginning at its junction with PR-568 (old Road No. 10) in western Corozal to continue to Ciales through PR-155, PR-633 and PR-6633 until its end at PR-6685 (former Road No. 11).