| Niagara Falls to Cascais | 3,541.54 mi (5,699.55 km) |
| Niagara Falls to Castelo Branco | 3,594.66 mi (5,785.05 km) |
| Niagara Falls to Castro Daire | 3,539.31 mi (5,695.97 km) |
| Niagara Falls to Celorico de Basto | 3,520.85 mi (5,666.26 km) |
| Niagara Falls to Chamusca | 3,564.05 mi (5,735.78 km) |
| Niagara Falls to Chaves | 3,533.86 mi (5,687.20 km) |
| Niagara Falls to Cinfaes | 3,523.68 mi (5,670.81 km) |
| Niagara Falls to Coimbra | 3,538.45 mi (5,694.59 km) |
| Niagara Falls to Condeixa-a-Nova | 3,538.21 mi (5,694.19 km) |
| Niagara Falls to Corroios | 3,556.95 mi (5,724.36 km) |
| Niagara Falls to Coruche | 3,575.02 mi (5,753.43 km) |
| Niagara Falls to Costa de Caparica | 3,551.94 mi (5,716.30 km) |
| Niagara Falls to Covilha | 3,579.35 mi (5,760.40 km) |
| Niagara Falls to Eiras | 3,537.69 mi (5,693.36 km) |
| Niagara Falls to Elvas | 3,642.77 mi (5,862.47 km) |
