| Olney to Cascais | 3,546.60 mi (5,707.69 km) |
| Olney to Castelo Branco | 3,610.40 mi (5,810.37 km) |
| Olney to Castro Daire | 3,560.44 mi (5,729.97 km) |
| Olney to Celorico de Basto | 3,544.69 mi (5,704.62 km) |
| Olney to Chamusca | 3,574.95 mi (5,753.33 km) |
| Olney to Chaves | 3,560.87 mi (5,730.67 km) |
| Olney to Cinfaes | 3,545.57 mi (5,706.05 km) |
| Olney to Coimbra | 3,554.50 mi (5,720.42 km) |
| Olney to Condeixa-a-Nova | 3,553.55 mi (5,718.89 km) |
| Olney to Corroios | 3,562.10 mi (5,732.65 km) |
| Olney to Coruche | 3,583.54 mi (5,767.15 km) |
| Olney to Costa de Caparica | 3,557.08 mi (5,724.57 km) |
| Olney to Covilha | 3,597.78 mi (5,790.07 km) |
| Olney to Eiras | 3,553.93 mi (5,719.50 km) |
| Olney to Elvas | 3,653.82 mi (5,880.26 km) |
