| Marietta to Oswego (Illinois) | 572.69 mi (921.66 km) |
| Marietta to Oswego (New York) | 785.70 mi (1,264.46 km) |
| Marietta to Otsego (Minnesota) | 917.56 mi (1,476.68 km) |
| Marietta to Ottawa (Illinois) | 562.37 mi (905.05 km) |
| Marietta to Ottawa (Kansas) | 677.36 mi (1,090.11 km) |
| Marietta to Ottumwa (Iowa) | 651.21 mi (1,048.02 km) |
| Marietta to Overland (Missouri) | 460.89 mi (741.73 km) |
| Marietta to Overland Park (Kansas) | 658.43 mi (1,059.64 km) |
| Marietta to Overlea (Maryland) | 580.60 mi (934.38 km) |
| Marietta to Oviedo (Florida) | 415.96 mi (669.43 km) |
| Marietta to Owasso (Oklahoma) | 657.62 mi (1,058.34 km) |
| Marietta to Owatonna (Minnesota) | 840.44 mi (1,352.55 km) |
| Marietta to Owensboro (Kentucky) | 299.77 mi (482.43 km) |
| Marietta to Owings Mills (Maryland) | 571.14 mi (919.16 km) |
| Marietta to Owosso (Michigan) | 625.07 mi (1,005.95 km) |
