| On Top of the World Designated Place to Olivares | 4,317.97 mi (6,949.10 km) |
| On Top of the World Designated Place to Olivenza | 4,243.55 mi (6,829.34 km) |
| On Top of the World Designated Place to Olot | 4,651.37 mi (7,485.65 km) |
| On Top of the World Designated Place to Onate | 4,395.92 mi (7,074.55 km) |
| On Top of the World Designated Place to Onda | 4,566.11 mi (7,348.45 km) |
| On Top of the World Designated Place to Onteniente | 4,574.39 mi (7,361.77 km) |
| On Top of the World Designated Place to Orihuela | 4,573.76 mi (7,360.75 km) |
| On Top of the World Designated Place to Osuna | 4,376.82 mi (7,043.81 km) |
| On Top of the World Designated Place to Ourense | 4,140.89 mi (6,664.12 km) |
| On Top of the World Designated Place to Oviedo | 4,223.36 mi (6,796.84 km) |
| On Top of the World Designated Place to Paiporta | 4,570.31 mi (7,355.21 km) |
| On Top of the World Designated Place to Pajara | 4,068.80 mi (6,548.10 km) |
| On Top of the World Designated Place to Palafolls | 4,675.93 mi (7,525.18 km) |
| On Top of the World Designated Place to Palafrugell | 4,690.09 mi (7,547.98 km) |
| On Top of the World Designated Place to Palamos | 4,690.13 mi (7,548.03 km) |
