National Tertiary Route 406, or just Route 406 (Spanish: Ruta Nacional Terciaria 406, or Ruta 406) is a National Road Route of Costa Rica, located in the San José and Cartago provinces.

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

In Cartago province the route covers Cartago canton (Corralillo district), El Guarco canton (San Isidro district).

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