| Gloucester City to Olivares | 3,629.23 mi (5,840.67 km) |
| Gloucester City to Olivenza | 3,545.37 mi (5,705.72 km) |
| Gloucester City to Olot | 3,900.22 mi (6,276.80 km) |
| Gloucester City to Onate | 3,648.91 mi (5,872.35 km) |
| Gloucester City to Onda | 3,838.61 mi (6,177.65 km) |
| Gloucester City to Onteniente | 3,857.20 mi (6,207.56 km) |
| Gloucester City to Orihuela | 3,863.76 mi (6,218.11 km) |
| Gloucester City to Osuna | 3,686.69 mi (5,933.15 km) |
| Gloucester City to Ourense | 3,410.86 mi (5,489.24 km) |
| Gloucester City to Oviedo | 3,480.53 mi (5,601.37 km) |
| Gloucester City to Paiporta | 3,847.58 mi (6,192.08 km) |
| Gloucester City to Pajara | 3,511.48 mi (5,651.18 km) |
| Gloucester City to Palafolls | 3,927.92 mi (6,321.37 km) |
| Gloucester City to Palafrugell | 3,939.33 mi (6,339.74 km) |
| Gloucester City to Palamos | 3,939.95 mi (6,340.74 km) |
