| Country: | CRI |
| Type: | Tertiary |
| Route: | 406 |
| Map Custom: | yes --> |
| Direction A: | NORTH/SOUTH/EAST/WEST? |
| Direction B: | NORTH/SOUTH/EAST/WEST? |
| Terminus B: | --> |
| Provinces: | San José, Cartago |
| Length Km: | 10.860 |
| Length Round: | 2 |
| Previous Type: | RNT |
| Previous Route: | 405 |
| Next Type: | RNT |
| Next Route: | 407 |
National Tertiary Route 406, or just Route 406 (Spanish; Castilian: Ruta Nacional Terciaria 406, or Spanish; Castilian: 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).