| Oregon to Cascais | 3,787.81 mi (6,095.88 km) |
| Oregon to Castelo Branco | 3,841.07 mi (6,181.61 km) |
| Oregon to Castro Daire | 3,785.67 mi (6,092.45 km) |
| Oregon to Celorico de Basto | 3,767.15 mi (6,062.65 km) |
| Oregon to Chamusca | 3,810.44 mi (6,132.30 km) |
| Oregon to Chaves | 3,780.07 mi (6,083.44 km) |
| Oregon to Cinfaes | 3,770.03 mi (6,067.27 km) |
| Oregon to Coimbra | 3,784.86 mi (6,091.14 km) |
| Oregon to Condeixa-a-Nova | 3,784.62 mi (6,090.75 km) |
| Oregon to Corroios | 3,803.22 mi (6,120.70 km) |
| Oregon to Coruche | 3,821.37 mi (6,149.90 km) |
| Oregon to Costa de Caparica | 3,798.22 mi (6,112.64 km) |
| Oregon to Covilha | 3,825.74 mi (6,156.93 km) |
| Oregon to Eiras | 3,784.10 mi (6,089.92 km) |
| Oregon to Elvas | 3,889.16 mi (6,259.00 km) |
