| Allentown to Cocentaina | 3,864.48 mi (6,219.28 km) |
| Allentown to Coin | 3,721.99 mi (5,989.97 km) |
| Allentown to Colindres | 3,584.51 mi (5,768.72 km) |
| Allentown to Collado-Villalba | 3,636.60 mi (5,852.54 km) |
| Allentown to Colmenar Viejo | 3,647.36 mi (5,869.86 km) |
| Allentown to Colmenarejo | 3,638.31 mi (5,855.30 km) |
| Allentown to Conil de la Frontera | 3,668.90 mi (5,904.52 km) |
| Allentown to Consuegra | 3,690.68 mi (5,939.57 km) |
| Allentown to Corbera de Llobregat | 3,891.01 mi (6,261.97 km) |
| Allentown to Cordoba | 3,682.28 mi (5,926.06 km) |
| Allentown to Coria del Rio | 3,638.71 mi (5,855.94 km) |
| Allentown to Crevillente | 3,862.83 mi (6,216.62 km) |
| Allentown to Cuarte de Huerva | 3,753.88 mi (6,041.28 km) |
| Allentown to Cubellas | 3,885.60 mi (6,253.27 km) |
| Allentown to Cuellar | 3,599.96 mi (5,793.57 km) |
