| Merrillville to Olivares | 4,174.11 mi (6,717.58 km) |
| Merrillville to Olivenza | 4,084.49 mi (6,573.34 km) |
| Merrillville to Olot | 4,385.83 mi (7,058.31 km) |
| Merrillville to Onate | 4,142.84 mi (6,667.26 km) |
| Merrillville to Onda | 4,349.01 mi (6,999.05 km) |
| Merrillville to Onteniente | 4,376.55 mi (7,043.38 km) |
| Merrillville to Orihuela | 4,389.09 mi (7,063.56 km) |
| Merrillville to Osuna | 4,229.79 mi (6,807.19 km) |
| Merrillville to Ourense | 3,925.40 mi (6,317.33 km) |
| Merrillville to Oviedo | 3,981.51 mi (6,407.62 km) |
| Merrillville to Paiporta | 4,362.19 mi (7,020.27 km) |
| Merrillville to Pajara | 4,123.38 mi (6,635.93 km) |
| Merrillville to Palafolls | 4,416.53 mi (7,107.71 km) |
| Merrillville to Palafrugell | 4,424.78 mi (7,120.99 km) |
| Merrillville to Palamos | 4,426.04 mi (7,123.03 km) |
