| Gross-Gerau to Oestrich-Winkel | 22.27 mi (35.84 km) |
| Gross-Gerau to Offenburg | 103.40 mi (166.41 km) |
| Gross-Gerau to Oftersheim | 38.17 mi (61.42 km) |
| Gross-Gerau to Ohrdruf | 117.27 mi (188.73 km) |
| Gross-Gerau to Ohringen | 67.37 mi (108.42 km) |
| Gross-Gerau to Olbernhau | 220.11 mi (354.23 km) |
| Gross-Gerau to Olching | 174.75 mi (281.24 km) |
| Gross-Gerau to Oldenburg | 223.11 mi (359.06 km) |
| Gross-Gerau to Oldenburg in Holstein | 319.29 mi (513.84 km) |
| Gross-Gerau to Olfen | 133.18 mi (214.33 km) |
| Gross-Gerau to Olpe | 81.06 mi (130.46 km) |
| Gross-Gerau to Olsberg | 98.86 mi (159.10 km) |
| Gross-Gerau to Oranienburg | 283.52 mi (456.28 km) |
| Gross-Gerau to Ortenberg | 39.34 mi (63.32 km) |
| Gross-Gerau to Oschatz | 223.96 mi (360.42 km) |
