| Grass Valley to Oswego (Illinois) | 1,718.00 mi (2,764.85 km) |
| Grass Valley to Oswego (New York) | 2,301.87 mi (3,704.51 km) |
| Grass Valley to Otsego (Minnesota) | 1,455.85 mi (2,342.96 km) |
| Grass Valley to Ottawa (Illinois) | 1,695.00 mi (2,727.84 km) |
| Grass Valley to Ottawa (Kansas) | 1,382.44 mi (2,224.83 km) |
| Grass Valley to Ottumwa (Iowa) | 1,511.11 mi (2,431.90 km) |
| Grass Valley to Overland (Missouri) | 1,640.96 mi (2,640.87 km) |
| Grass Valley to Overland Park (Kansas) | 1,409.76 mi (2,268.79 km) |
| Grass Valley to Overlea (Maryland) | 2,356.51 mi (3,792.43 km) |
| Grass Valley to Oviedo (Florida) | 2,377.36 mi (3,826.00 km) |
| Grass Valley to Owasso (Oklahoma) | 1,388.02 mi (2,233.80 km) |
| Grass Valley to Owatonna (Minnesota) | 1,467.45 mi (2,361.64 km) |
| Grass Valley to Owensboro (Kentucky) | 1,827.27 mi (2,940.71 km) |
| Grass Valley to Owings Mills (Maryland) | 2,341.53 mi (3,768.33 km) |
| Grass Valley to Owosso (Michigan) | 1,921.69 mi (3,092.67 km) |
