| Iowa City to Opwijk | 4,283.90 mi (6,894.27 km) |
| Iowa City to Ostend | 4,227.95 mi (6,804.23 km) |
| Iowa City to Oud-Heverlee | 4,306.59 mi (6,930.79 km) |
| Iowa City to Oud-Turnhout | 4,299.94 mi (6,920.08 km) |
| Iowa City to Oudenaarde | 4,266.80 mi (6,866.75 km) |
| Iowa City to Oudenburg | 4,232.47 mi (6,811.50 km) |
| Iowa City to Oupeye | 4,346.99 mi (6,995.81 km) |
| Iowa City to Overijse | 4,303.59 mi (6,925.95 km) |
| Iowa City to Overpelt | 4,319.41 mi (6,951.41 km) |
| Iowa City to Paal | 4,317.28 mi (6,948.00 km) |
| Iowa City to Peer | 4,323.93 mi (6,958.69 km) |
| Iowa City to Pepinster | 4,358.75 mi (7,014.73 km) |
| Iowa City to Peruwelz | 4,278.53 mi (6,885.62 km) |
| Iowa City to Perwez | 4,319.92 mi (6,952.24 km) |
| Iowa City to Philippeville | 4,326.20 mi (6,962.34 km) |
