| Aci Castello to Opwijk | 1,071.10 mi (1,723.76 km) |
| Aci Castello to Ostend | 1,117.64 mi (1,798.67 km) |
| Aci Castello to Oud-Heverlee | 1,051.71 mi (1,692.57 km) |
| Aci Castello to Oud-Turnhout | 1,072.55 mi (1,726.09 km) |
| Aci Castello to Oudenaarde | 1,079.17 mi (1,736.75 km) |
| Aci Castello to Oudenburg | 1,113.19 mi (1,791.51 km) |
| Aci Castello to Oupeye | 1,021.73 mi (1,644.32 km) |
| Aci Castello to Overijse | 1,052.05 mi (1,693.11 km) |
| Aci Castello to Overpelt | 1,056.97 mi (1,701.03 km) |
| Aci Castello to Paal | 1,051.91 mi (1,692.88 km) |
| Aci Castello to Peer | 1,051.16 mi (1,691.69 km) |
| Aci Castello to Pepinster | 1,009.44 mi (1,624.53 km) |
| Aci Castello to Peruwelz | 1,061.09 mi (1,707.65 km) |
| Aci Castello to Perwez | 1,036.07 mi (1,667.40 km) |
| Aci Castello to Philippeville | 1,018.37 mi (1,638.90 km) |
