| Greensboro to Olivares | 3,968.01 mi (6,385.90 km) |
| Greensboro to Olivenza | 3,886.70 mi (6,255.04 km) |
| Greensboro to Olot | 4,256.00 mi (6,849.37 km) |
| Greensboro to Onate | 4,003.40 mi (6,442.85 km) |
| Greensboro to Onda | 4,188.50 mi (6,740.74 km) |
| Greensboro to Onteniente | 4,204.41 mi (6,766.34 km) |
| Greensboro to Orihuela | 4,209.03 mi (6,773.78 km) |
| Greensboro to Osuna | 4,026.01 mi (6,479.24 km) |
| Greensboro to Ourense | 3,760.70 mi (6,052.26 km) |
| Greensboro to Oviedo | 3,833.76 mi (6,169.84 km) |
| Greensboro to Paiporta | 4,196.24 mi (6,753.20 km) |
| Greensboro to Pajara | 3,807.34 mi (6,127.32 km) |
| Greensboro to Palafolls | 4,283.00 mi (6,892.82 km) |
| Greensboro to Palafrugell | 4,295.06 mi (6,912.24 km) |
| Greensboro to Palamos | 4,295.55 mi (6,913.02 km) |
