| Grain Valley to Oswego (Illinois) | 359.76 mi (578.97 km) |
| Grain Valley to Oswego (New York) | 967.53 mi (1,557.09 km) |
| Grain Valley to Otsego (Minnesota) | 432.80 mi (696.53 km) |
| Grain Valley to Ottawa (Illinois) | 326.74 mi (525.83 km) |
| Grain Valley to Ottawa (Kansas) | 63.72 mi (102.54 km) |
| Grain Valley to Ottumwa (Iowa) | 167.65 mi (269.81 km) |
| Grain Valley to Overland (Missouri) | 207.75 mi (334.34 km) |
| Grain Valley to Overland Park (Kansas) | 27.24 mi (43.84 km) |
| Grain Valley to Overlea (Maryland) | 946.15 mi (1,522.68 km) |
| Grain Valley to Oviedo (Florida) | 1,032.67 mi (1,661.92 km) |
| Grain Valley to Owasso (Oklahoma) | 208.41 mi (335.41 km) |
| Grain Valley to Owatonna (Minnesota) | 354.20 mi (570.03 km) |
| Grain Valley to Owensboro (Kentucky) | 393.67 mi (633.54 km) |
| Grain Valley to Owings Mills (Maryland) | 931.33 mi (1,498.84 km) |
| Grain Valley to Owosso (Michigan) | 590.36 mi (950.09 km) |
