| Gross-Gerau to Olivenza | 1,089.59 mi (1,753.53 km) |
| Gross-Gerau to Olot | 606.52 mi (976.10 km) |
| Gross-Gerau to Onate | 702.56 mi (1,130.67 km) |
| Gross-Gerau to Onda | 808.90 mi (1,301.81 km) |
| Gross-Gerau to Onteniente | 887.06 mi (1,427.59 km) |
| Gross-Gerau to Orihuela | 940.76 mi (1,514.01 km) |
| Gross-Gerau to Osuna | 1,105.71 mi (1,779.47 km) |
| Gross-Gerau to Ourense | 938.81 mi (1,510.87 km) |
| Gross-Gerau to Oviedo | 814.88 mi (1,311.42 km) |
| Gross-Gerau to Paiporta | 845.30 mi (1,360.37 km) |
| Gross-Gerau to Pajara | 1,904.28 mi (3,064.64 km) |
| Gross-Gerau to Palafolls | 632.97 mi (1,018.67 km) |
| Gross-Gerau to Palafrugell | 608.80 mi (979.76 km) |
| Gross-Gerau to Palamos | 614.04 mi (988.20 km) |
| Gross-Gerau to Palencia | 827.96 mi (1,332.47 km) |
