| Iowa City to Norwich | 4,118.68 mi (6,628.37 km) |
| Iowa City to Nottingham | 4,018.68 mi (6,467.44 km) |
| Iowa City to Nuneaton | 4,021.14 mi (6,471.40 km) |
| Iowa City to Oadby | 4,033.09 mi (6,490.63 km) |
| Iowa City to Oakengates | 3,979.16 mi (6,403.85 km) |
| Iowa City to Oakham | 4,043.32 mi (6,507.09 km) |
| Iowa City to Oldbury | 4,001.45 mi (6,439.71 km) |
| Iowa City to Oldham | 3,964.22 mi (6,379.80 km) |
| Iowa City to Ollerton | 4,015.32 mi (6,462.03 km) |
| Iowa City to Olton | 4,011.44 mi (6,455.79 km) |
| Iowa City to Omagh | 3,743.88 mi (6,025.19 km) |
| Iowa City to Ormesby | 3,965.81 mi (6,382.36 km) |
| Iowa City to Ormskirk | 3,935.43 mi (6,333.46 km) |
| Iowa City to Orpington | 4,118.13 mi (6,627.49 km) |
| Iowa City to Ossett | 3,979.38 mi (6,404.19 km) |
