| Gretz-Armainvilliers to Oestrich-Winkel | 252.31 mi (406.05 km) |
| Gretz-Armainvilliers to Offenburg | 238.25 mi (383.42 km) |
| Gretz-Armainvilliers to Oftersheim | 268.38 mi (431.91 km) |
| Gretz-Armainvilliers to Ohrdruf | 384.61 mi (618.97 km) |
| Gretz-Armainvilliers to Ohringen | 308.40 mi (496.32 km) |
| Gretz-Armainvilliers to Olbernhau | 491.47 mi (790.94 km) |
| Gretz-Armainvilliers to Olching | 394.72 mi (635.24 km) |
| Gretz-Armainvilliers to Oldenburg | 386.36 mi (621.78 km) |
| Gretz-Armainvilliers to Oldenburg in Holstein | 519.21 mi (835.59 km) |
| Gretz-Armainvilliers to Olfen | 290.57 mi (467.63 km) |
| Gretz-Armainvilliers to Olpe | 276.06 mi (444.28 km) |
| Gretz-Armainvilliers to Olsberg | 312.20 mi (502.44 km) |
| Gretz-Armainvilliers to Oranienburg | 535.62 mi (861.99 km) |
| Gretz-Armainvilliers to Ortenberg | 304.41 mi (489.90 km) |
| Gretz-Armainvilliers to Oschatz | 492.74 mi (792.99 km) |
