| Idar-Oberstein to Oswego (Illinois) | 4,327.37 mi (6,964.22 km) |
| Idar-Oberstein to Oswego (New York) | 3,792.31 mi (6,103.13 km) |
| Idar-Oberstein to Otsego (Minnesota) | 4,345.91 mi (6,994.07 km) |
| Idar-Oberstein to Ottawa (Illinois) | 4,361.30 mi (7,018.84 km) |
| Idar-Oberstein to Ottawa (Kansas) | 4,735.67 mi (7,621.32 km) |
| Idar-Oberstein to Ottumwa (Iowa) | 4,510.48 mi (7,258.92 km) |
| Idar-Oberstein to Overland (Missouri) | 4,548.46 mi (7,320.04 km) |
| Idar-Oberstein to Overland Park (Kansas) | 4,699.98 mi (7,563.89 km) |
| Idar-Oberstein to Overlea (Maryland) | 3,971.79 mi (6,391.97 km) |
| Idar-Oberstein to Oviedo (Florida) | 4,672.41 mi (7,519.52 km) |
| Idar-Oberstein to Owasso (Oklahoma) | 4,874.77 mi (7,845.19 km) |
| Idar-Oberstein to Owatonna (Minnesota) | 4,389.33 mi (7,063.95 km) |
| Idar-Oberstein to Owensboro (Kentucky) | 4,469.34 mi (7,192.71 km) |
| Idar-Oberstein to Owings Mills (Maryland) | 3,980.81 mi (6,406.50 km) |
| Idar-Oberstein to Owosso (Michigan) | 4,109.43 mi (6,613.48 km) |
