| Cantanhede to Olympia Heights (Florida) | 4,163.49 mi (6,700.49 km) |
| Cantanhede to Omaha (Nebraska) | 4,360.06 mi (7,016.84 km) |
| Cantanhede to On Top of the World Designated Place (Florida) | 4,136.93 mi (6,657.75 km) |
| Cantanhede to Onalaska (Wisconsin) | 4,056.18 mi (6,527.79 km) |
| Cantanhede to Oneida (New York) | 3,369.72 mi (5,423.05 km) |
| Cantanhede to Oneonta (New York) | 3,357.06 mi (5,402.67 km) |
| Cantanhede to Ontario (California) | 5,595.70 mi (9,005.40 km) |
| Cantanhede to Ontario (Oregon) | 5,106.78 mi (8,218.58 km) |
| Cantanhede to Opa-locka (Florida) | 4,152.45 mi (6,682.73 km) |
| Cantanhede to Opelika (Alabama) | 4,163.45 mi (6,700.42 km) |
| Cantanhede to Opelousas (Louisiana) | 4,575.08 mi (7,362.88 km) |
| Cantanhede to Orange (California) | 5,615.84 mi (9,037.82 km) |
| Cantanhede to Orange (Texas) | 4,673.38 mi (7,521.08 km) |
| Cantanhede to Orange City (Florida) | 4,092.17 mi (6,585.72 km) |
| Cantanhede to Orangeburg (South Carolina) | 3,909.23 mi (6,291.30 km) |
