| Harper Woods to Olivares | 3,941.01 mi (6,342.44 km) |
| Harper Woods to Olivenza | 3,851.87 mi (6,198.98 km) |
| Harper Woods to Olot | 4,160.17 mi (6,695.15 km) |
| Harper Woods to Onate | 3,915.71 mi (6,301.73 km) |
| Harper Woods to Onda | 4,119.81 mi (6,630.20 km) |
| Harper Woods to Onteniente | 4,146.25 mi (6,672.75 km) |
| Harper Woods to Orihuela | 4,158.10 mi (6,691.81 km) |
| Harper Woods to Osuna | 3,996.87 mi (6,432.35 km) |
| Harper Woods to Ourense | 3,695.35 mi (5,947.08 km) |
| Harper Woods to Oviedo | 3,753.24 mi (6,040.26 km) |
| Harper Woods to Paiporta | 4,132.47 mi (6,650.56 km) |
| Harper Woods to Pajara | 3,889.24 mi (6,259.12 km) |
| Harper Woods to Palafolls | 4,190.45 mi (6,743.87 km) |
| Harper Woods to Palafrugell | 4,199.18 mi (6,757.93 km) |
| Harper Woods to Palamos | 4,200.35 mi (6,759.82 km) |
