National Tertiary Route 409, or just Route 409 (Spanish: Ruta Nacional Terciaria 409, or Ruta 409) is a National Road Route of Costa Rica, located in the San José, Cartago provinces.

[1] In San José province the route covers Desamparados canton (San Antonio district).

In Cartago province the route covers La Unión canton (Tres Ríos, San Diego, Río Azul districts).

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