| Irmo to Cascais | 3,900.54 mi (6,277.31 km) |
| Irmo to Castelo Branco | 3,971.60 mi (6,391.68 km) |
| Irmo to Castro Daire | 3,925.57 mi (6,317.59 km) |
| Irmo to Celorico de Basto | 3,911.69 mi (6,295.25 km) |
| Irmo to Chamusca | 3,932.95 mi (6,329.48 km) |
| Irmo to Chaves | 3,929.86 mi (6,324.50 km) |
| Irmo to Cinfaes | 3,911.29 mi (6,294.61 km) |
| Irmo to Coimbra | 3,916.21 mi (6,302.53 km) |
| Irmo to Condeixa-a-Nova | 3,914.78 mi (6,300.23 km) |
| Irmo to Corroios | 3,916.03 mi (6,302.24 km) |
| Irmo to Coruche | 3,939.80 mi (6,340.49 km) |
| Irmo to Costa de Caparica | 3,911.02 mi (6,294.19 km) |
| Irmo to Covilha | 3,960.90 mi (6,374.46 km) |
| Irmo to Eiras | 3,915.78 mi (6,301.84 km) |
| Irmo to Elvas | 4,011.52 mi (6,455.92 km) |
