Puerto Rico Highway 339 (PR-339) is a rural road located entirely in the municipality of Mayagüez, Puerto Rico.

[2] With a length of 5.0 kilometers (3.1 mi),[1] it begins at its intersection with PR-105 in Limón barrio[3] and ends at its junction with PR-119 in Montoso barrio.

[4] The entire route is located in Mayagüez.

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