| Hillsborough to Olivares | 3,591.32 mi (5,779.68 km) |
| Hillsborough to Olivenza | 3,506.90 mi (5,643.81 km) |
| Hillsborough to Olot | 3,857.98 mi (6,208.82 km) |
| Hillsborough to Onate | 3,607.07 mi (5,805.02 km) |
| Hillsborough to Onda | 3,797.98 mi (6,112.26 km) |
| Hillsborough to Onteniente | 3,817.24 mi (6,143.26 km) |
| Hillsborough to Orihuela | 3,824.27 mi (6,154.57 km) |
| Hillsborough to Osuna | 3,648.65 mi (5,871.93 km) |
| Hillsborough to Ourense | 3,370.32 mi (5,424.00 km) |
| Hillsborough to Oviedo | 3,439.07 mi (5,534.64 km) |
| Hillsborough to Paiporta | 3,807.26 mi (6,127.20 km) |
| Hillsborough to Pajara | 3,482.40 mi (5,604.38 km) |
| Hillsborough to Palafolls | 3,885.87 mi (6,253.71 km) |
| Hillsborough to Palafrugell | 3,897.10 mi (6,271.77 km) |
| Hillsborough to Palamos | 3,897.76 mi (6,272.84 km) |
