| Cities | Distance |
|---|---|
| Holyhead to Nuth | 475.30 mi (764.92 km) |
| Holyhead to Oegstgeest | 388.18 mi (624.71 km) |
| Holyhead to Oirschot | 436.54 mi (702.55 km) |
| Holyhead to Oisterwijk | 430.52 mi (692.86 km) |
| Holyhead to Oldebroek | 442.77 mi (712.58 km) |
| Holyhead to Oldenzaal | 487.31 mi (784.26 km) |
| Holyhead to Ommen | 463.16 mi (745.38 km) |
| Holyhead to Oosterend | 443.37 mi (713.53 km) |
| Holyhead to Oosterhout | 415.27 mi (668.32 km) |
| Holyhead to Oosterwolde | 452.77 mi (728.66 km) |
| Holyhead to Oostzaan | 401.16 mi (645.60 km) |
| Holyhead to Opmeer | 400.34 mi (644.29 km) |
| Holyhead to Oss | 439.23 mi (706.88 km) |
| Holyhead to Oud-Beijerland | 392.86 mi (632.24 km) |
| Holyhead to Oudenbosch | 403.16 mi (648.82 km) |