| Cedar Rapids to Opwijk | 4,274.21 mi (6,878.68 km) |
| Cedar Rapids to Ostend | 4,218.35 mi (6,788.78 km) |
| Cedar Rapids to Oud-Heverlee | 4,296.89 mi (6,915.17 km) |
| Cedar Rapids to Oud-Turnhout | 4,290.02 mi (6,904.13 km) |
| Cedar Rapids to Oudenaarde | 4,257.23 mi (6,851.36 km) |
| Cedar Rapids to Oudenburg | 4,222.87 mi (6,796.05 km) |
| Cedar Rapids to Oupeye | 4,337.19 mi (6,980.03 km) |
| Cedar Rapids to Overijse | 4,293.92 mi (6,910.39 km) |
| Cedar Rapids to Overpelt | 4,309.47 mi (6,935.41 km) |
| Cedar Rapids to Paal | 4,307.44 mi (6,932.15 km) |
| Cedar Rapids to Peer | 4,314.01 mi (6,942.72 km) |
| Cedar Rapids to Pepinster | 4,348.97 mi (6,998.99 km) |
| Cedar Rapids to Peruwelz | 4,269.08 mi (6,870.42 km) |
| Cedar Rapids to Perwez | 4,310.26 mi (6,936.70 km) |
| Cedar Rapids to Philippeville | 4,316.72 mi (6,947.09 km) |
