| Odorheiu Secuiesc to Oswego (Illinois) | 5,119.41 mi (8,238.89 km) |
| Odorheiu Secuiesc to Oswego (New York) | 4,611.86 mi (7,422.07 km) |
| Odorheiu Secuiesc to Otsego (Minnesota) | 5,100.69 mi (8,208.77 km) |
| Odorheiu Secuiesc to Ottawa (Illinois) | 5,153.10 mi (8,293.11 km) |
| Odorheiu Secuiesc to Ottawa (Kansas) | 5,515.42 mi (8,876.21 km) |
| Odorheiu Secuiesc to Ottumwa (Iowa) | 5,290.71 mi (8,514.58 km) |
| Odorheiu Secuiesc to Overland (Missouri) | 5,346.07 mi (8,603.66 km) |
| Odorheiu Secuiesc to Overland Park (Kansas) | 5,480.79 mi (8,820.47 km) |
| Odorheiu Secuiesc to Overlea (Maryland) | 4,805.95 mi (7,734.43 km) |
| Odorheiu Secuiesc to Oviedo (Florida) | 5,522.94 mi (8,888.31 km) |
| Odorheiu Secuiesc to Owasso (Oklahoma) | 5,661.83 mi (9,111.83 km) |
| Odorheiu Secuiesc to Owatonna (Minnesota) | 5,151.73 mi (8,290.92 km) |
| Odorheiu Secuiesc to Owensboro (Kentucky) | 5,281.22 mi (8,499.31 km) |
| Odorheiu Secuiesc to Owings Mills (Maryland) | 4,814.22 mi (7,747.74 km) |
| Odorheiu Secuiesc to Owosso (Michigan) | 4,909.32 mi (7,900.79 km) |
