| Howard to Cascais | 3,922.66 mi (6,312.90 km) |
| Howard to Castelo Branco | 3,965.76 mi (6,382.27 km) |
| Howard to Castro Daire | 3,905.78 mi (6,285.75 km) |
| Howard to Celorico de Basto | 3,884.89 mi (6,252.12 km) |
| Howard to Chamusca | 3,939.80 mi (6,340.50 km) |
| Howard to Chaves | 3,894.73 mi (6,267.96 km) |
| Howard to Cinfaes | 3,889.55 mi (6,259.63 km) |
| Howard to Coimbra | 3,909.69 mi (6,292.04 km) |
| Howard to Condeixa-a-Nova | 3,910.10 mi (6,292.69 km) |
| Howard to Corroios | 3,937.87 mi (6,337.40 km) |
| Howard to Coruche | 3,952.82 mi (6,361.45 km) |
| Howard to Costa de Caparica | 3,932.92 mi (6,329.42 km) |
| Howard to Covilha | 3,948.04 mi (6,353.76 km) |
| Howard to Eiras | 3,908.76 mi (6,290.54 km) |
| Howard to Elvas | 4,017.79 mi (6,466.01 km) |
