| Odorheiu Secuiesc to Olympia Heights (Florida) | 5,637.92 mi (9,073.35 km) |
| Odorheiu Secuiesc to Omaha (Nebraska) | 5,393.94 mi (8,680.71 km) |
| Odorheiu Secuiesc to On Top of the World Designated Place (Florida) | 5,544.57 mi (8,923.12 km) |
| Odorheiu Secuiesc to Onalaska (Wisconsin) | 5,098.50 mi (8,205.24 km) |
| Odorheiu Secuiesc to Oneida (New York) | 4,598.23 mi (7,400.14 km) |
| Odorheiu Secuiesc to Oneonta (New York) | 4,604.80 mi (7,410.72 km) |
| Odorheiu Secuiesc to Ontario (California) | 6,423.43 mi (10,337.51 km) |
| Odorheiu Secuiesc to Ontario (Oregon) | 5,783.11 mi (9,307.01 km) |
| Odorheiu Secuiesc to Opa-locka (Florida) | 5,625.43 mi (9,053.26 km) |
| Odorheiu Secuiesc to Opelika (Alabama) | 5,482.12 mi (8,822.63 km) |
| Odorheiu Secuiesc to Opelousas (Louisiana) | 5,847.17 mi (9,410.10 km) |
| Odorheiu Secuiesc to Orange (California) | 6,443.36 mi (10,369.59 km) |
| Odorheiu Secuiesc to Orange (Texas) | 5,930.35 mi (9,543.97 km) |
| Odorheiu Secuiesc to Orange City (Florida) | 5,512.90 mi (8,872.15 km) |
| Odorheiu Secuiesc to Orangeburg (South Carolina) | 5,264.45 mi (8,472.31 km) |
