| Arenys de Mar to Olympia Heights (Florida) | 4,711.66 mi (7,582.69 km) |
| Arenys de Mar to Omaha (Nebraska) | 4,787.63 mi (7,704.95 km) |
| Arenys de Mar to On Top of the World Designated Place (Florida) | 4,668.23 mi (7,512.79 km) |
| Arenys de Mar to Onalaska (Wisconsin) | 4,481.64 mi (7,212.50 km) |
| Arenys de Mar to Oneida (New York) | 3,841.90 mi (6,182.95 km) |
| Arenys de Mar to Oneonta (New York) | 3,834.95 mi (6,171.76 km) |
| Arenys de Mar to Ontario (California) | 5,980.25 mi (9,624.28 km) |
| Arenys de Mar to Ontario (Oregon) | 5,436.64 mi (8,749.42 km) |
| Arenys de Mar to Opa-locka (Florida) | 4,700.21 mi (7,564.26 km) |
| Arenys de Mar to Opelika (Alabama) | 4,671.22 mi (7,517.60 km) |
| Arenys de Mar to Opelousas (Louisiana) | 5,074.02 mi (8,165.84 km) |
| Arenys de Mar to Orange (California) | 6,000.64 mi (9,657.10 km) |
| Arenys de Mar to Orange (Texas) | 5,169.15 mi (8,318.94 km) |
| Arenys de Mar to Orange City (Florida) | 4,626.52 mi (7,445.66 km) |
| Arenys de Mar to Orangeburg (South Carolina) | 4,424.68 mi (7,120.84 km) |
