| Grottaferrata to Olivenza | 1,062.17 mi (1,709.39 km) |
| Grottaferrata to Olot | 523.36 mi (842.27 km) |
| Grottaferrata to Onate | 773.44 mi (1,244.74 km) |
| Grottaferrata to Onda | 686.78 mi (1,105.27 km) |
| Grottaferrata to Onteniente | 728.21 mi (1,171.94 km) |
| Grottaferrata to Orihuela | 764.46 mi (1,230.29 km) |
| Grottaferrata to Osuna | 996.06 mi (1,603.00 km) |
| Grottaferrata to Ourense | 1,051.48 mi (1,692.20 km) |
| Grottaferrata to Oviedo | 946.40 mi (1,523.08 km) |
| Grottaferrata to Paiporta | 704.96 mi (1,134.53 km) |
| Grottaferrata to Pajara | 1,764.66 mi (2,839.94 km) |
| Grottaferrata to Palafolls | 511.36 mi (822.95 km) |
| Grottaferrata to Palafrugell | 489.19 mi (787.27 km) |
| Grottaferrata to Palamos | 491.16 mi (790.44 km) |
| Grottaferrata to Palencia | 883.42 mi (1,421.72 km) |
