| Ericeira to Olympia Heights (Florida) | 4,136.90 mi (6,657.70 km) |
| Ericeira to Omaha (Nebraska) | 4,374.96 mi (7,040.82 km) |
| Ericeira to On Top of the World Designated Place (Florida) | 4,118.18 mi (6,627.58 km) |
| Ericeira to Onalaska (Wisconsin) | 4,072.29 mi (6,553.72 km) |
| Ericeira to Oneida (New York) | 3,374.02 mi (5,429.97 km) |
| Ericeira to Oneonta (New York) | 3,359.57 mi (5,406.70 km) |
| Ericeira to Ontario (California) | 5,618.90 mi (9,042.75 km) |
| Ericeira to Ontario (Oregon) | 5,142.89 mi (8,276.68 km) |
| Ericeira to Opa-locka (Florida) | 4,126.08 mi (6,640.29 km) |
| Ericeira to Opelika (Alabama) | 4,153.97 mi (6,685.17 km) |
| Ericeira to Opelousas (Louisiana) | 4,568.07 mi (7,351.60 km) |
| Ericeira to Orange (California) | 5,638.95 mi (9,075.01 km) |
| Ericeira to Orange (Texas) | 4,667.30 mi (7,511.29 km) |
| Ericeira to Orange City (Florida) | 4,072.16 mi (6,553.52 km) |
| Ericeira to Orangeburg (South Carolina) | 3,897.31 mi (6,272.11 km) |
