| Delfzijl to Oerlinghausen | 119.56 mi (192.42 km) |
| Delfzijl to Oestrich-Winkel | 234.93 mi (378.09 km) |
| Delfzijl to Offenburg | 339.15 mi (545.80 km) |
| Delfzijl to Oftersheim | 283.08 mi (455.57 km) |
| Delfzijl to Ohrdruf | 237.04 mi (381.47 km) |
| Delfzijl to Ohringen | 306.59 mi (493.41 km) |
| Delfzijl to Olbernhau | 329.12 mi (529.67 km) |
| Delfzijl to Olching | 403.26 mi (648.99 km) |
| Delfzijl to Oldenburg | 55.21 mi (88.86 km) |
| Delfzijl to Oldenburg in Holstein | 175.01 mi (281.66 km) |
| Delfzijl to Olfen | 113.40 mi (182.51 km) |
| Delfzijl to Olpe | 164.70 mi (265.06 km) |
| Delfzijl to Olsberg | 152.15 mi (244.86 km) |
| Delfzijl to Oranienburg | 265.47 mi (427.24 km) |
| Delfzijl to Ortenberg | 225.04 mi (362.17 km) |
