| Marshalltown to Olivares | 4,413.85 mi (7,103.41 km) |
| Marshalltown to Olivenza | 4,322.03 mi (6,955.64 km) |
| Marshalltown to Olot | 4,598.55 mi (7,400.65 km) |
| Marshalltown to Onate | 4,360.43 mi (7,017.43 km) |
| Marshalltown to Onda | 4,572.84 mi (7,359.27 km) |
| Marshalltown to Onteniente | 4,604.23 mi (7,409.79 km) |
| Marshalltown to Orihuela | 4,619.38 mi (7,434.17 km) |
| Marshalltown to Osuna | 4,468.55 mi (7,191.44 km) |
| Marshalltown to Ourense | 4,152.98 mi (6,683.58 km) |
| Marshalltown to Oviedo | 4,202.97 mi (6,764.02 km) |
| Marshalltown to Paiporta | 4,587.83 mi (7,383.40 km) |
| Marshalltown to Pajara | 4,393.43 mi (7,070.54 km) |
| Marshalltown to Palafolls | 4,630.42 mi (7,451.95 km) |
| Marshalltown to Palafrugell | 4,637.23 mi (7,462.91 km) |
| Marshalltown to Palamos | 4,638.78 mi (7,465.40 km) |
